Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 91: 13

$x=-1$

We need to get the x alone. Thus, we cancel out the addition by subtracting 7 on both sides. This leaves us with the equation $-8=8x$. In order to cancel out multiplication, we use division, so we divide both sides of the equation by 8 to get that x=-1. We plug -1 in for x and confirm that our answer is, indeed, correct.