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x=6-4
x=2
x-y=4
xy=4
x-y=4
x=6-4
x-y=4
x=2
2-y=4
-y=2 /*(-1)
y=-2
x=2
y=-2
spr.
x+4=6
x-y=4
2+4=6
2-(-2)=4
6=6
4=4
8-4=4