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(12y2+17y-4)+9y2-13y+3)
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(12y2+17y-4)+9y2-13y+3)

User Zia Qamar
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(12y^2+17y-4)+(9y^2-13y+3)=12y^2+9y^2+17y-13y-4+3=\\\\=21y^2+4y-1
User Prashant Pandey
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