| $$ \begin{aligned}10c+b+7a-5c-a+5b+4b+8a-6c& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}14a+10b-c\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{10c} + \color{red}{b} + \color{green}{7a} \color{orange}{-5c} \color{blue}{-a} + \color{red}{5b} + \color{red}{4b} + \color{blue}{8a} \color{orange}{-6c} = \color{blue}{14a} + \color{red}{10b} \color{orange}{-c} $$ |