| $$ \begin{aligned}2+3i+8-i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2i+10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2} + \color{red}{3i} + \color{blue}{8} \color{red}{-i} = \color{red}{2i} + \color{blue}{10} $$ |