(1)(x+1)-2(x-1)=1-3x
x+1-2x+2=1-3x
3-x=1-3x
2x=-2
x=-1
(2)4(x-2)-12x=24-3(x+1)
4x-8-12x=24-3x-3
-8x-8=21-3x
5x=-29
x=-29/5
(3)2(4y+5)-3(3y-2)=1
8y+10-9y+6=1
16-y=1
y=15
(4)x-(x-1)=21-(x+3)
x-x+1=21-x-3
1=18-x
x=17