Question

for c.
3c - 15 = -45

Explanation:

Step1: Add 15 to both sides

$3c - 15 + 15 = -45 + 15$
$3c = -30$

Step2: Divide by 3 on both sides

$\frac{3c}{3} = \frac{-30}{3}$
$c = -10$

Answer:

$c = -10$