Answer
$$-9r^3+2r-5r^3+3-20r=-14r^3-18r+3$$
Explanation
| $$ \begin{aligned}-9r^3+2r-5r^3+3-20r& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-14r^3-18r+3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-9r^3} + \color{red}{2r} \color{blue}{-5r^3} +3 \color{red}{-20r} = \color{blue}{-14r^3} \color{red}{-18r} +3 $$ |
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