| $$ \begin{aligned}8x-9y+16x+12y& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}24x+3y\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{8x} \color{red}{-9y} + \color{blue}{16x} + \color{red}{12y} = \color{blue}{24x} + \color{red}{3y} $$ |