$$ \begin{aligned}-24v^2-72v^3+40v^5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}40v^5-72v^3-24v^2\end{aligned} $$ | |
① | Combine like terms: $$ 40v^5-72v^3-24v^2 = 40v^5-72v^3-24v^2 $$ |