6xy-4x²-y²-2 from x²-3xy+7y²+5
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Answer:
5x²-9xy+8y²+7
Step-by-step explanation:
=x²-3xy+7y²+5-(6xy-4x²-y²-2)
=x²-3xy+7y²+5-6xy+4x²+y²+2
=5x²-9xy+8y²+7
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