Question
$$4 = 16-3a$$
Answer
$$ a = 4 $$
Explanation
$$ \begin{aligned} 4 &= 16-3a&& \text{ swap the left and right side of the equation } \\[1 em]16-3a &= 4&& \text{ move 16 to the right } \\[1 em]-3a &= 4-16&& \\[1 em]-3a &= -12&& \text{ divide both sides by $ -3 $ } \\[1 em]a &= \frac{-12}{-3}&& \\[1 em]a &= 4&& \\[1 em] \end{aligned} $$
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