# How do you solve -3(4 + x) = 15?

May 12, 2016

x=-9

#### Explanation:

$- 3 \left(4 + x\right) = 15$

Multiply every 4 and x by -3
$- 12 - 3 x = 15$

Carry over -12 to the right side of the equal sign and add it to 15 and cancel out -12 on the other side:
$- 3 x = 15 + 12$
$- 3 x = 27$

Divide 27 by -3 and cancel out -3 on the other side:
$- 3 \frac{x}{-} 3 = \frac{27}{-} 3$