2x^2+xy^2-3y-6=2x^2-( )=xy^2+( )
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2x^2+xy^2-3y-6=2x^2-( )=xy^2+( )
2x^2+xy^2-3y-6=2x^2-(-xy^2+3y+6)=xy^2+(2x^2-3y-6)
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