| $$ \begin{aligned}3-2i+i+6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-i+9\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3} \color{red}{-2i} + \color{red}{i} + \color{blue}{6} = \color{red}{-i} + \color{blue}{9} $$ |