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

User Sam Yi
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(12y^2 + 17y - 4) + (9y^2 - 13y + 3)

= 12y^2 + 17y - 4 + 9y^2 - 13y + 3

= 21y^2 + 4y - 1
User Cameron Hurd
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