| $$ \begin{aligned}8m^4+m-2-10-5m^2+3m^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}11m^4-5m^2+m-12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{8m^4} +m \color{red}{-2} \color{red}{-10} -5m^2+ \color{blue}{3m^4} = \color{blue}{11m^4} -5m^2+m \color{red}{-12} $$ |