Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 92: 48

$k=4$

We need to get the k alone. Thus, we cancel out the addition by subtracting 4 on both sides. This leaves us with the equation $-5k=-20$. In order to cancel out multiplication, we use division, so we divide both sides by -5 to get that $k=4$. We plug 4 in for k and confirm that our answer is, indeed, correct.