6x=3x-7
3x=-7
x=-7/3
5=7+2x
2x=-2
x=-1
y-1/2=1/2y-2
2y-1=y-4
y=-3
11/9x+2/7=2/9x-5/7
11/9x-2/9x=-2/7-5/7
x=-1