Answer
9$y^{2}$+25y-40
Work Step by Step
(12y-20)+(9$y^{2}$+13y-20)
=12y-20+9$y^{2}$+13y-20
=9$y^{2}$+12y+13y-20-20
=9$y^{2}$+25y-40
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