| $$ \begin{aligned}9y-8y+3y-2y& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2y\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{9y} \color{red}{-8y} + \color{green}{3y} \color{green}{-2y} = \color{green}{2y} $$ |