| $$ \begin{aligned}7x^6+2x^5+5x^6+6+9x^5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12x^6+11x^5+6\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7x^6} + \color{red}{2x^5} + \color{blue}{5x^6} +6+ \color{red}{9x^5} = \color{blue}{12x^6} + \color{red}{11x^5} +6 $$ |