| $$ \begin{aligned}3-2x-6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2x-3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3} -2x \color{blue}{-6} = -2x \color{blue}{-3} $$ |