Subtract 5x2-3xy+y2-6 from the sum of 3x2-8xy+7 and - 5x2+7xy - 3y2-4
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3x²-8xy+7
5x²+7xy-3y²-4
_____________
8x²-xy-3y²+3
8x²-xy-3y²+3
-5x²+3xy-y²+6
_____________
3x²+2xy-4y²+9
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