Answer:
r = -189
Step-by-step explanation:
-13 - 8 = r/9
- 21 = r/9
r = 9 * -21
-13= r/9 +8
To solve this equation, we will start by subtracting 8 from each side
-13-8 = r/9 +8-8
-21 = r/9
Multiply each side by 9 to isolate r
-21*9 = r
-189 =r
