130:(84:(b-2)) = 26
130 / (84 / (b - 2)) = 26
130 (b - 2) / 84 = 26
130(b - 2) = 84 26
130b - 260 = 2184
130b = 2444
b = 2444 / 130
b = 18.8

(360 / (x + 70)) * 50 = 3800
360 / (x + 70) = 3800 / 50
360 / (x + 70) = 76
x + 70 = 360 / 76
x + 70 = 4.73684
x = 4.73684 - 70
x = -65.2632

360 / (18 - x) - 120 = 280
360 / (18 - x) = 280 + 120
360 / (18 - x) = 400
18 - x = 360 / 400
18 - x = 0.45
-x = -17.55
x = 17.55