add 8x^2+ 7xy_6y^2 , 4x^2_ 3xy+2y^2 and _4y^2 +xy_y^2
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(8x ^2 + 7xy - 6y ^2) + (4x^2 -3xy +2y^2 ) + ( -4 x^2 +XY -y^2 )
= > 8x^2 + 5xy -5y^2
hope it help you
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