Solve 6x-36/x^2-36div12x^2-36x/x^2+9x-36=x+12/2x^2+12x

$$\frac { 6 x - 36 } { x ^ { 2 } - 36 } \div \frac { 12 x ^ { 2 } - 36 x } { x ^ { 2 } + 9 x - 36 } = \frac { x + 12 } { 2 x ^ { 2 } + 12 x }$$

Solve for x (complex solution)

$$x\in \mathrm{C}\setminus -6,6,0,-12,3$$

Short Solution Steps

Variable x cannot be equal to any of the values -6,0 since division by zero is not defined. Multiply both sides of the equation by 2x\left(x+6\right).

$$\frac{1}{6}\left(x+6\right)\left(12+x\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply \frac{1}{6} by x+6.

$$\left(\frac{1}{6}x+1\right)\left(12+x\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply \frac{1}{6}x+1 by 12+x and combine like terms.

$$\left(3x+\frac{1}{6}x^{2}+12\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply 3x+\frac{1}{6}x^{2}+12 by \frac{6x-36}{x^{2}-36}.

$$3x\times \frac{6x-36}{x^{2}-36}+\frac{1}{6}x^{2}\times \frac{6x-36}{x^{2}-36}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Express 3\times \frac{6x-36}{x^{2}-36} as a single fraction.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{1}{6}x^{2}\times \frac{6x-36}{x^{2}-36}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Multiply \frac{1}{6} times \frac{6x-36}{x^{2}-36} by multiplying numerator times numerator and denominator times denominator.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Express 12\times \frac{6x-36}{x^{2}-36} as a single fraction.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Use the distributive property to multiply 3 by 6x-36.

$$\frac{18x-108}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Express \frac{18x-108}{x^{2}-36}x as a single fraction.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Factor the expressions that are not already factored in \frac{6x-36}{6\left(x^{2}-36\right)}.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{6\left(x-6\right)}{6\left(x-6\right)\left(x+6\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Cancel out 6 in both numerator and denominator.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{x-6}{\left(x-6\right)\left(x+6\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Express \frac{x-6}{\left(x-6\right)\left(x+6\right)}x^{2} as a single fraction.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Use the distributive property to multiply 12 by 6x-36.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Factor x^{2}-36.

$$\frac{\left(18x-108\right)x}{\left(x-6\right)\left(x+6\right)}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Since \frac{\left(18x-108\right)x}{\left(x-6\right)\left(x+6\right)} and \frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)} have the same denominator, add them by adding their numerators.

$$\frac{\left(18x-108\right)x+\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Do the multiplications in \left(18x-108\right)x+\left(x-6\right)x^{2}.

$$\frac{18x^{2}-108x+x^{3}-6x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Combine like terms in 18x^{2}-108x+x^{3}-6x^{2}.

$$\frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Factor x^{2}-36.

$$\frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Since \frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)} and \frac{72x-432}{\left(x-6\right)\left(x+6\right)} have the same denominator, add them by adding their numerators.

$$\frac{12x^{2}-108x+x^{3}+72x-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Combine like terms in 12x^{2}-108x+x^{3}+72x-432.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Consider \left(x-6\right)\left(x+6\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 6.

$$\frac{12x^{2}-36x+x^{3}-432}{x^{2}-36}=x+12$$

Subtract x from both sides.

$$\frac{12x^{2}-36x+x^{3}-432}{x^{2}-36}-x=12$$

Factor x^{2}-36.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}-x=12$$

To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}-\frac{x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=12$$

Since \frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)} and \frac{x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)} have the same denominator, subtract them by subtracting their numerators.

$$\frac{12x^{2}-36x+x^{3}-432-x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=12$$

Do the multiplications in 12x^{2}-36x+x^{3}-432-x\left(x-6\right)\left(x+6\right).

$$\frac{12x^{2}-36x+x^{3}-432-x^{3}-6x^{2}+6x^{2}+36x}{\left(x-6\right)\left(x+6\right)}=12$$

Combine like terms in 12x^{2}-36x+x^{3}-432-x^{3}-6x^{2}+6x^{2}+36x.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}=12$$

Subtract 12 from both sides.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}-12=0$$

To add or subtract expressions, expand them to make their denominators the same. Multiply 12 times \frac{\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}-\frac{12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=0$$

Since \frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)} and \frac{12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)} have the same denominator, subtract them by subtracting their numerators.

$$\frac{12x^{2}-432-12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=0$$

Do the multiplications in 12x^{2}-432-12\left(x-6\right)\left(x+6\right).

$$\frac{12x^{2}-432-12x^{2}-72x+72x+432}{\left(x-6\right)\left(x+6\right)}=0$$

Combine like terms in 12x^{2}-432-12x^{2}-72x+72x+432.

$$\frac{0}{\left(x-6\right)\left(x+6\right)}=0$$

Variable x cannot be equal to any of the values -6,6 since division by zero is not defined. Multiply both sides of the equation by \left(x-6\right)\left(x+6\right).

$$0=0$$

This is true for any x.

$$x\in \mathrm{C}$$

Variable x cannot be equal to any of the values -6,6,0.

$$x\in \mathrm{C}\setminus -6,0,6$$

Solve for x

$$x\in \mathrm{R}\setminus 6,-6,0,3,-12$$

Short Solution Steps

Variable x cannot be equal to any of the values -6,0 since division by zero is not defined. Multiply both sides of the equation by 2x\left(x+6\right).

$$\frac{1}{6}\left(x+6\right)\left(12+x\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply \frac{1}{6} by x+6.

$$\left(\frac{1}{6}x+1\right)\left(12+x\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply \frac{1}{6}x+1 by 12+x and combine like terms.

$$\left(3x+\frac{1}{6}x^{2}+12\right)\times \frac{6x-36}{x^{2}-36}=x+12$$

Use the distributive property to multiply 3x+\frac{1}{6}x^{2}+12 by \frac{6x-36}{x^{2}-36}.

$$3x\times \frac{6x-36}{x^{2}-36}+\frac{1}{6}x^{2}\times \frac{6x-36}{x^{2}-36}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Express 3\times \frac{6x-36}{x^{2}-36} as a single fraction.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{1}{6}x^{2}\times \frac{6x-36}{x^{2}-36}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Multiply \frac{1}{6} times \frac{6x-36}{x^{2}-36} by multiplying numerator times numerator and denominator times denominator.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+12\times \frac{6x-36}{x^{2}-36}=x+12$$

Express 12\times \frac{6x-36}{x^{2}-36} as a single fraction.

$$\frac{3\left(6x-36\right)}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Use the distributive property to multiply 3 by 6x-36.

$$\frac{18x-108}{x^{2}-36}x+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Express \frac{18x-108}{x^{2}-36}x as a single fraction.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{6x-36}{6\left(x^{2}-36\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Factor the expressions that are not already factored in \frac{6x-36}{6\left(x^{2}-36\right)}.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{6\left(x-6\right)}{6\left(x-6\right)\left(x+6\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Cancel out 6 in both numerator and denominator.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{x-6}{\left(x-6\right)\left(x+6\right)}x^{2}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Express \frac{x-6}{\left(x-6\right)\left(x+6\right)}x^{2} as a single fraction.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{12\left(6x-36\right)}{x^{2}-36}=x+12$$

Use the distributive property to multiply 12 by 6x-36.

$$\frac{\left(18x-108\right)x}{x^{2}-36}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Factor x^{2}-36.

$$\frac{\left(18x-108\right)x}{\left(x-6\right)\left(x+6\right)}+\frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Since \frac{\left(18x-108\right)x}{\left(x-6\right)\left(x+6\right)} and \frac{\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)} have the same denominator, add them by adding their numerators.

$$\frac{\left(18x-108\right)x+\left(x-6\right)x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Do the multiplications in \left(18x-108\right)x+\left(x-6\right)x^{2}.

$$\frac{18x^{2}-108x+x^{3}-6x^{2}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Combine like terms in 18x^{2}-108x+x^{3}-6x^{2}.

$$\frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{x^{2}-36}=x+12$$

Factor x^{2}-36.

$$\frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)}+\frac{72x-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Since \frac{12x^{2}-108x+x^{3}}{\left(x-6\right)\left(x+6\right)} and \frac{72x-432}{\left(x-6\right)\left(x+6\right)} have the same denominator, add them by adding their numerators.

$$\frac{12x^{2}-108x+x^{3}+72x-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Combine like terms in 12x^{2}-108x+x^{3}+72x-432.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}=x+12$$

Consider \left(x-6\right)\left(x+6\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 6.

$$\frac{12x^{2}-36x+x^{3}-432}{x^{2}-36}=x+12$$

Subtract x from both sides.

$$\frac{12x^{2}-36x+x^{3}-432}{x^{2}-36}-x=12$$

Factor x^{2}-36.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}-x=12$$

To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}.

$$\frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)}-\frac{x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=12$$

Since \frac{12x^{2}-36x+x^{3}-432}{\left(x-6\right)\left(x+6\right)} and \frac{x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)} have the same denominator, subtract them by subtracting their numerators.

$$\frac{12x^{2}-36x+x^{3}-432-x\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=12$$

Do the multiplications in 12x^{2}-36x+x^{3}-432-x\left(x-6\right)\left(x+6\right).

$$\frac{12x^{2}-36x+x^{3}-432-x^{3}-6x^{2}+6x^{2}+36x}{\left(x-6\right)\left(x+6\right)}=12$$

Combine like terms in 12x^{2}-36x+x^{3}-432-x^{3}-6x^{2}+6x^{2}+36x.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}=12$$

Subtract 12 from both sides.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}-12=0$$

To add or subtract expressions, expand them to make their denominators the same. Multiply 12 times \frac{\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}.

$$\frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)}-\frac{12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=0$$

Since \frac{12x^{2}-432}{\left(x-6\right)\left(x+6\right)} and \frac{12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)} have the same denominator, subtract them by subtracting their numerators.

$$\frac{12x^{2}-432-12\left(x-6\right)\left(x+6\right)}{\left(x-6\right)\left(x+6\right)}=0$$

Do the multiplications in 12x^{2}-432-12\left(x-6\right)\left(x+6\right).

$$\frac{12x^{2}-432-12x^{2}-72x+72x+432}{\left(x-6\right)\left(x+6\right)}=0$$

Combine like terms in 12x^{2}-432-12x^{2}-72x+72x+432.

$$\frac{0}{\left(x-6\right)\left(x+6\right)}=0$$

Variable x cannot be equal to any of the values -6,6 since division by zero is not defined. Multiply both sides of the equation by \left(x-6\right)\left(x+6\right).

$$0=0$$

This is true for any x.

$$x\in \mathrm{R}$$

Variable x cannot be equal to any of the values -6,6,0.

$$x\in \mathrm{R}\setminus -6,0,6$$