| $$ \begin{aligned}7p+3+5p+8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12p+11\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7p} + \color{red}{3} + \color{blue}{5p} + \color{red}{8} = \color{blue}{12p} + \color{red}{11} $$ |