| $$ \begin{aligned}7x+3+6x+11& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}13x+14\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7x} + \color{red}{3} + \color{blue}{6x} + \color{red}{11} = \color{blue}{13x} + \color{red}{14} $$ |