| $$ \begin{aligned}2x+64x-12& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}66x-12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x} + \color{blue}{64x} -12 = \color{blue}{66x} -12 $$ |