| $$ \begin{aligned}3s+2s+s-1+5+4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6s+8\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3s} + \color{red}{2s} + \color{red}{s} = \color{red}{6s} $$Combine like terms: $$ \color{blue}{-1} + \color{red}{5} + \color{red}{4} = \color{red}{8} $$ |