Answer:
6n - 5 = -35
Adding 5 on both sides, we get
6n = -30
Dividing by 6 on both sides, we get
n = -5
R/12 = 25
Multiplying both sides by 12, we get
R = 300
9x + 3 = 21
Subtracting 3 from both sides, we get
9x = 18
Dividing by 9 on both sides, we get
x = 2