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(-x+y)2 + 3x= -(x+y)2 +2y - 3
x-y=-8
x2+2xy+y2+3x= x2+2xy+y2+2y-3
x-y=-8 /*(-3)
3x-2y=-3 /
-3x+3y= 24
3x-2y=3
+_________
y=27
y=27
x= 19