add 5y (3y^2+5y–7) and 5(y^3–4y^2+5
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5y (3y^2+5y–7) + 5(y^3–4y^2+5
=15y^3+25y^2-35y+5y^3-20y^2+20
=20y3+5y^2-35y+20
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