| $$ \begin{aligned}15+3y-y+5y-1& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7y+14\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{15} + \color{red}{3y} \color{green}{-y} + \color{green}{5y} \color{blue}{-1} = \color{green}{7y} + \color{blue}{14} $$ |