Answer
$$2c-12c^3-5c^4+7c+10c^4=5c^4-12c^3+9c$$
Explanation
| $$ \begin{aligned}2c-12c^3-5c^4+7c+10c^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5c^4-12c^3+9c\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2c} -12c^3 \color{red}{-5c^4} + \color{blue}{7c} + \color{red}{10c^4} = \color{red}{5c^4} -12c^3+ \color{blue}{9c} $$ |
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