| $$ \begin{aligned}-6-15i-14i+1& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-29i-5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-6} \color{red}{-15i} \color{red}{-14i} + \color{blue}{1} = \color{red}{-29i} \color{blue}{-5} $$ |