| $$ \begin{aligned}-8m^6+5+2m^7-2m^6+3m^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2m^7-10m^6+3m^3+5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-8m^6} +5+2m^7 \color{blue}{-2m^6} +3m^3 = 2m^7 \color{blue}{-10m^6} +3m^3+5 $$ |