1)3x + 4 = 7x - 8
4x = 12
x = 3
2)2x - 3 = 10
2x = 13
x = 13/2
3)2(x+1) = 3(x+1)
x+1 = 0
x = -1
4)3x-5=3-3x
6x = 8
x = 4/3
5)3x + 6 = 3(3x+2)
3x + 6 = 9x +6
3x = 9x
x = 3x
x = 0
Объяснение:
подумал бы чуть чуть)))
