| $$ \begin{aligned}-6-5i+i-18& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4i-24\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-6} \color{red}{-5i} + \color{red}{i} \color{blue}{-18} = \color{red}{-4i} \color{blue}{-24} $$ |