Answer:
r = 3
Step-by-step explanation:
− 3 ( 6 r + 2 ) + 5 ( r + 1 ) = − 40
- 18r - 6 + 5 ( r + 1 ) = - 40
- 18r - 6 + 5r + 5 = - 40
-13r - 1 = - 40
-13r = - 39
