$$ \begin{aligned}2m^2-3+4m^3+5m-3-6m^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4m^3-4m^2+5m-6\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{2m^2} \color{red}{-3} +4m^3+5m \color{red}{-3} \color{blue}{-6m^2} = 4m^3 \color{blue}{-4m^2} +5m \color{red}{-6} $$ |