Question
$$3+6i-12-3 = 0$$
Answer
$$ i = 2 $$
Explanation
$$ \begin{aligned} 3+6i-12-3 &= 0&& \text{simplify left side} \\[1 em]3+6i+(-15) &= 0&& \\[1 em]3+6i+(-15) &= 0&& \\[1 em]6i-12 &= 0&& \text{ move the constants to the right } \\[1 em]6i &= 12&& \text{ divide both sides by $ 6 $ } \\[1 em]i &= \frac{12}{6}&& \\[1 em]i &= 2&& \\[1 em] \end{aligned} $$
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