add 8x^2 +7xy-6y^2 , -4x^2- 3xy+ 2y^2 and -4x^2+ xy-y^2
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Subtract the sum of 3x^2 + 2xy - 2y^2 and 5y^2 - 7xy from 5x^2 + 2y^2 - 3xy
Missing: 8x^ 6y^
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