$$79 = 5a+9$$
Answer
$$ a = 14 $$
Explanation
$$ \begin{aligned} 79 &= 5a+9&& \text{ swap the left and right side of the equation } \\[1 em]5a+9 &= 79&& \text{ move 9 to the right } \\[1 em]5a &= 79-9&& \\[1 em]5a &= 70&& \text{ divide both sides by $ 5 $ } \\[1 em]a &= \frac{70}{5}&& \\[1 em]a &= 14&& \\[1 em] \end{aligned} $$
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