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x-y=1
x+y=2
x+y= -1
y= -2x+4
y-x=-2
2x-y=0
2x+y=2
x=y+5
2y=X+1
x=y-5
2y=x+1
x-y=5
2y=x-1
x-y=5
y+2=x-1