Subtract. Simplify the answer.

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8 votes

$(r^3-9r^2+3r)-(8r^3-8r^2+3r-7)=\\\\=r^3-9r^2+3r-8r^3+8r^2-3r+7=\\\\=r^3-8r^3-9r^2+8r^2+3r-3r+7=\boxed{-7r^3-r^2+7}$

Matzeri answered Feb 9, 2022

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