| $$ \begin{aligned}7x+52x-10& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}59x-10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7x} + \color{blue}{52x} -10 = \color{blue}{59x} -10 $$ |