### Home > MC2 > Chapter 8 > Lesson 8.1.1 > Problem8-8

8-8.

Solve each equation.

1. $3(x + 4) =-42$

Distribute.
$3(x) + 3(4) =-42$

Simplify.
$3x + 12 =-42$

Subtract $12$ from each side.
$3x + 12 =-42$
$−12 −12$
$3x = −54$

$x =-18$

1. $90 = 5-(2x + 1)$

Distribute.
$90 = 5-2x-1$

Simplify.
$90 = 4-2x$

Subtract 4 from each side.
$90 = 4-2x$
$−4 −4$
$86 = −2x$

$x =-43$

1. $5(3 + x) = 3x$

Follow the methods presented in part (a) and part (b).