| $$ \begin{aligned}5+6i-2+4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10i+3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{5} + \color{red}{6i} \color{blue}{-2} + \color{red}{4i} = \color{red}{10i} + \color{blue}{3} $$ |