| $$ \begin{aligned}2y^5+4y^5-3y^3-5y^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6y^5-8y^3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2y^5} + \color{blue}{4y^5} \color{red}{-3y^3} \color{red}{-5y^3} = \color{blue}{6y^5} \color{red}{-8y^3} $$ |