SOLUTION: add (2x^2-7xy+y^2)+(-8x^2-4xy-y^2)+(x^2+xy-9y^2)
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Question 476449
:
add
(2x^2-7xy+y^2)+(-8x^2-4xy-y^2)+(x^2+xy-9y^2)
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Tatiana_Stebko(1539)
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