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