Chapter 3 - Equations and Problem Solving - 3.2 - Equations and Problem Solving - Problem Set 3.2 - Page 107: 58

X = -5

Let X represent the number we need to find. Nine times a certain number means 9X. Nine times a certain number is subtracted from 7 means 7 - 9X. Thus, we obtain: 7 - 9X = 52 Subtract 7 from both sides -9X = 45 Divide both sides by -9 X = -5