1,5(x-1) = 3-3x
5X-5 = 3-3X
5X+3X = 3+5
8X = 8
X = 1
2,3-2（2x+1）= 2（x-3）
3-4X-2 = 2X-6
-4X-2X = -6-3+2
-6X = -6
X = 1
3,4x-3（20-x）= 6x-7（9-x）
4X-60+3X = 6X -63 +7X
4X+3X-6X-7X = -63+60
-6X = -3
X = 1/2
4,12（2-3x） = 4x+4
24-36x = 4x+4
24-4 = 4x+36x
20 = 40x
x = 1/2