Answer
$$6-10i-10-i=-11i-4$$
Explanation
| $$ \begin{aligned}6-10i-10-i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-11i-4\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{6} \color{red}{-10i} \color{blue}{-10} \color{red}{-i} = \color{red}{-11i} \color{blue}{-4} $$ |
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