Пошаговое объяснение:
3х+2-х=6,
2x + 2 = 6
2x = 6 - 2
2x = 4
x = 4 : 2
x = 2
3(x-1)-x=o,
3x - 3 - x = 0
2x - 3 = 0
2x = 3
x = 3 : 2
x = 1,5
7-3y+4y-4=-1
3 + y = -1
y = -1 - 3
y = -4
