| $$ \begin{aligned}6x+8+4x+4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10x+12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{6x} + \color{red}{8} + \color{blue}{4x} + \color{red}{4} = \color{blue}{10x} + \color{red}{12} $$ |