Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 92: 47

$p=-2$

We need to get the p alone, so we cancel out the addition by subtracting 9 on both sides. This leaves us with the equation $6=-3p$. We cancel out multiplication by using division, so we divide both sides of the equation by -3 to get that p=-2. We plug -2 in for p and confirm that our answer is, indeed, correct.