| $$ \begin{aligned}8x^6+6x^3+4x^6+3+2x^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12x^6+8x^3+3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{8x^6} + \color{red}{6x^3} + \color{blue}{4x^6} +3+ \color{red}{2x^3} = \color{blue}{12x^6} + \color{red}{8x^3} +3 $$ |