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