| $$ \begin{aligned}4+6i+8-10i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4i+12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{4} + \color{red}{6i} + \color{blue}{8} \color{red}{-10i} = \color{red}{-4i} + \color{blue}{12} $$ |