1) 56y - 36y - 9 = 15320y - 9 = 15320y = 162y = 8.1
2) (158u - 21) * 3 + 27 = 234474u - 63 + 27 = 234474u - 36 = 234474u = 270u = 0.568
3) (36t + 98) / 14 = 2536t + 98 = 14 * 2536t + 98 = 35036t = 252t = 7
4) (12x + 30x + 42) / 6 = 2142x + 42 = 12642x = 84x = 2.
1) 56y - 36y - 9 = 153
20y - 9 = 153
20y = 162
y = 8.1
2) (158u - 21) * 3 + 27 = 234
474u - 63 + 27 = 234
474u - 36 = 234
474u = 270
u = 0.568
3) (36t + 98) / 14 = 25
36t + 98 = 14 * 25
36t + 98 = 350
36t = 252
t = 7
4) (12x + 30x + 42) / 6 = 21
42x + 42 = 126
42x = 84
x = 2.