| $$ \begin{aligned}9-5x+2x-8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-3x+1\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{9} \color{red}{-5x} + \color{red}{2x} \color{blue}{-8} = \color{red}{-3x} + \color{blue}{1} $$ |