Answer
$$-6+3i+5+4i=7i-1$$
Explanation
| $$ \begin{aligned}-6+3i+5+4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7i-1\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-6} + \color{red}{3i} + \color{blue}{5} + \color{red}{4i} = \color{red}{7i} \color{blue}{-1} $$ |
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