Solve for x
x = \frac{21}{4} = 5\frac{1}{4} = 5.25
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x-4+4\left(x+1\right)=4\left(x+7\right)-\left(x-5\right)-2\left(x+6\right)
Multiply both sides of the equation by 8, the least common multiple of 8,2,4.
x-4+4x+4=4\left(x+7\right)-\left(x-5\right)-2\left(x+6\right)
Use the distributive property to multiply 4 by x+1.
5x-4+4=4\left(x+7\right)-\left(x-5\right)-2\left(x+6\right)
Combine x and 4x to get 5x.
5x=4\left(x+7\right)-\left(x-5\right)-2\left(x+6\right)
Add -4 and 4 to get 0.
5x=4x+28-\left(x-5\right)-2\left(x+6\right)
Use the distributive property to multiply 4 by x+7.
5x=4x+28-x-\left(-5\right)-2\left(x+6\right)
To find the opposite of x-5, find the opposite of each term.
5x=4x+28-x+5-2\left(x+6\right)
The opposite of -5 is 5.
5x=3x+28+5-2\left(x+6\right)
Combine 4x and -x to get 3x.
5x=3x+33-2\left(x+6\right)
Add 28 and 5 to get 33.
5x=3x+33-2x-12
Use the distributive property to multiply -2 by x+6.
5x=x+33-12
Combine 3x and -2x to get x.
5x=x+21
Subtract 12 from 33 to get 21.
5x-x=21
Subtract x from both sides.
4x=21
Combine 5x and -x to get 4x.
x=\frac{21}{4}
Divide both sides by 4.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}