| $$ \begin{aligned}5r^3+8+6r^3+3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}11r^3+11\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{5r^3} + \color{red}{8} + \color{blue}{6r^3} + \color{red}{3} = \color{blue}{11r^3} + \color{red}{11} $$ |