3=11-X
X=11-3
X=8
3-X=7
X=3-7
X=-4
2X+3=X-1
2X-X=-1-3
X=-4
2X-1=-X+5
2X+X=5+1
3X=6
X=2
11/9X+2/7=2/9X-5/7
X=-1
1/2X-1/2+1=X-1
1/2X=3/2
X=3
12(2-3X)=4X+4
40X=20
X=1/2