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