Question
$$-3\cdot(-13+j) = -6$$
Answer
$$ j = 15 $$
Explanation
$$ \begin{aligned} -3\cdot(-13+j) &= -6&& \text{simplify left side} \\[1 em]-(-39+3j) &= -6&& \\[1 em]39-3j &= -6&& \\[1 em]-3j+39 &= -6&& \text{ move 39 to the right } \\[1 em]-3j &= -6-39&& \\[1 em]-3j &= -45&& \text{ divide both sides by $ -3 $ } \\[1 em]j &= \frac{-45}{-3}&& \\[1 em]j &= 15&& \\[1 em] \end{aligned} $$
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