subtract 5 x² - 6y² + 8y -5 from 7x ² -5 x y+10y2+5x-4y
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7x²-5xy+10y²+5x-4y-(5x²-6y²+8y-5)
7x²-5xy+10y²+5x-4y-5x²+6y²-8y+5
2x²-5xy+16y²+5x-13y(ans.)
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