Solve {l}{7(3x+6)-9(2x-3)-9=-21}{text{onlikloriholledin:}}{4(2x-3)-5=6x-23}{5x-12-4(x-15)=18-x}

$$\left. \begin{array} { l } { 7 ( 3 x + 6 ) - 9 ( 2 x - 3 ) - 9 = - 21 } \\ { \text { onliklori holl edin: } } \\ { 4 ( 2 x - 3 ) - 5 = 6 x - 23 } \\ { 5 x - 12 - 4 ( x - 15 ) = 18 - x } \end{array} \right.$$

Solve for x

$$x=-27$$

Steps for Solving Linear Equation

Use the distributive property to multiply 7 by 3x+6.

$$21x+42-9\left(2x-3\right)-9=-21$$

Use the distributive property to multiply -9 by 2x-3.

$$21x+42-18x+27-9=-21$$

Combine 21x and -18x to get 3x.

$$3x+42+27-9=-21$$

Add 42 and 27 to get 69.

$$3x+69-9=-21$$

Subtract 9 from 69 to get 60.

$$3x+60=-21$$

Subtract 60 from both sides.

$$3x=-21-60$$

Subtract 60 from -21 to get -81.

$$3x=-81$$

Divide both sides by 3.

$$x=\frac{-81}{3}$$

Divide -81 by 3 to get -27.

$$x=-27$$