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x-y=2
1-y+2=2x+2
x-y=2
2x+y=1
x-y=2
3x=3
x=1
1-y=2
y=-1
x-y=2
1-y+2=2x+2
x=2+y
3-y=2x+2
x=2+y
3-y=2*(2+y)+2
x=2+y
3-y=4+2y+2 /-3
x=2+y
-y=6-2y-3 /-2y
x=2+y
-3y=3
x=2+y
y=-1
x=2-1=1