| $$ \begin{aligned}2x-3+4x-7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6x-10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x} \color{red}{-3} + \color{blue}{4x} \color{red}{-7} = \color{blue}{6x} \color{red}{-10} $$ |