Chapter 2 - Solving Equations - 2-4 Solving Equations With Variables on Both Sides - Practice and Problem-Solving Exercises - Page 106: 39

$c=-9$

$-2(-c-12)=-2c-12 \\\\2c+24=-2c-12 \\\\ 2c=-2c-36 \\\\ 4c=-36 \\\\ c=-9$ We first use the distributive property on the left side of the equation to simplify. We then subtract by 24 on both sides. Next, we add 2c on both sides. Finally, we divide by 4 to get that c=-9.