(30-n)/2 = 1530-n = 30n = 0
7b-15 = 67b = 21b = 3
20/(x/9) = 420 * 9 = 4x180 = 4xx = 45
(9t+37)/8 = 89t+37 = 649t = 27t = 3
(30-n)/2 = 15
30-n = 30
n = 0
7b-15 = 6
7b = 21
b = 3
20/(x/9) = 4
20 * 9 = 4x
180 = 4x
x = 45
(9t+37)/8 = 8
9t+37 = 64
9t = 27
t = 3