| $$ \begin{aligned}-6y^2+8y^3-4y^2+y-10y^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2y^3-10y^2+y\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-6y^2} + \color{red}{8y^3} \color{blue}{-4y^2} +y \color{red}{-10y^3} = \color{red}{-2y^3} \color{blue}{-10y^2} +y $$ |