Answer
$a=-3$
Work Step by Step
We are given the equation $-15=3(a-2)$. In order to solve, we can use the distributive property to simplify on the right side.
$-15=3(a-2)=3(a)+3(-2)=3a-6$
Add 6 to both sides.
$-15+6=3a-6+6$
$-9=3a$
Divide both sides by 3.
$\frac{-9}{3}=\frac{3a}{3}$
Therefore, $a=-3$.
