A) 10x - 5 + 3x - 3 - 42x + 72 = 120 - 15x
-29x + 64 = 120 - 15x
-14x + 64 = 120
-14x = 56
x = -4
B) 6x + 8 - 3x - 2 = 12x - 18 + 6 - 8x + 10x - 15
3x + 6 = 14x - 27
-11x + 6 = -27
-11x = -33
x = 3
C) 36x - 16 + 4x - 14 - 7x = 9x - 30 + 5x - 110 - 4
33x - 30 = 14x - 144
19x - 30 = -144
19x = - 114
x = -6
D) 10x - 8 - 3x - 2 + 11 = 15x - 30 + 3x - 24x + 18
7x + 1 = -6x - 12
13x + 1 = -12
13x = - 13
x = -1