$$ \begin{aligned}-2-3i-4-6i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-9i-6\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{-2} \color{red}{-3i} \color{blue}{-4} \color{red}{-6i} = \color{red}{-9i} \color{blue}{-6} $$ |