Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 91: 18

$c=-3$

We need to get the c alone. Thus, we cancel out the subtraction by adding 5 on both sides. This leaves us with the equation $-9=3c$. In order to cancel out multiplication, we use division, so we divide both sides by 3 to get that $c=-3$. We plug -3 in for c and confirm that our answer is, indeed, correct.