Пошаговое объяснение:
-7y−20=8y+100 .
8y + 7y = -20 - 100
15y = -120
y = -120 : 15
y = -8
8⋅(3+x)−3x=6x−59 .
24 + 8x - 3x = 6x - 59
24 + 5x = 6x - 59
6x - 5x = 24 + 59
x = 83
13x+4=16−16x .
13x + 16x = 16 - 4
29x = 12
x = 12 : 29
x = 12/29
