Question 958327
3(4r-8)=36

Expand:
12r - 24 = 36
12r - 24 + 24 = 36 + 24
12r = 60
12r / 12 = 60 / 12
r = 5

Or divide by 3 from both side
4r - 8 = 12
4r - 8 + 8 = 12 + 8
4r = 20
4r / 4 = 20 / 4
r = 5