Solve 42+x+40+x=(13+x)*9

$$42+x+40+x=(13+x) \times 9$$

Solve for x

$$x=-5$$

Steps for Solving Linear Equation

Add 42 and 40 to get 82.

$$82+x+x=\left(13+x\right)\times 9$$

Combine x and x to get 2x.

$$82+2x=\left(13+x\right)\times 9$$

Use the distributive property to multiply 13+x by 9.

$$82+2x=117+9x$$

Subtract 9x from both sides.

$$82+2x-9x=117$$

Combine 2x and -9x to get -7x.

$$82-7x=117$$

Subtract 82 from both sides.

$$-7x=117-82$$

Subtract 82 from 117 to get 35.

$$-7x=35$$

Divide both sides by -7.

$$x=\frac{35}{-7}$$

Divide 35 by -7 to get -5.

$$x=-5$$