Chapter 2 - Solving Equations - 2-1 Solving One-Step Equations - Practice and Problem-Solving Exercises - Page 85: 39

$q = 81$

$-9 = \frac{q}{-9}$ We need to isolate the variable $q$ by multiplying through by $-9$ as shown below: $-9 \times - 9 = \frac{q}{-9} \times -9$ Simplifying we have: $81 = q$ Rearranging the equation we have: $q = 81$ Therefore, the equation has a possible solution at $q = 81$