Answer
$$7r^3-8r+8r-8r^3=-r^3$$
Explanation
| $$ \begin{aligned}7r^3-8r+8r-8r^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-r^3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7r^3} \, \color{red}{ -\cancel{8r}} \,+ \, \color{red}{ \cancel{8r}} \, \color{blue}{-8r^3} = \color{blue}{-r^3} $$ |
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