| $$ \begin{aligned}-x+5+3x+2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x+7\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-x} + \color{red}{5} + \color{blue}{3x} + \color{red}{2} = \color{blue}{2x} + \color{red}{7} $$ |