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x-y=6
x=-y
-y-y=6
x=-y
-2y=6/-2
x=-y
y=-3
x=3
y=-3
x=-y
x-y=6
x=-y
-y-y=6
x=-y
-2y=6/(-2)
x=-y
y=-3
x=3
y=-3
x-y=6
x=-6
-y-y=6
x=-y
-2y=6/-2
x=-y
y=-3
x=3
y=-3