$$ \begin{aligned}5x+10-2x+5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x+15\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{5x} + \color{red}{10} \color{blue}{-2x} + \color{red}{5} = \color{blue}{3x} + \color{red}{15} $$ |