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-y=2-x
y=x-2
1/2-1=1/4y
y=4(1/2-1)
y=2-4
y=-2
x-2=-2
x=0
1/2-1=1/4y
{x-y=2
1/4=-1/2 /*4
y=-2
x-(-2)=2
x+2=2 /-2
x=0
y=-2
y=-2