$$ \begin{aligned} 60 &= 15a-5&& \text{ swap the left and right side of the equation } \\[1 em]15a-5 &= 60&& \text{ move -5 to the right } \\[1 em]15a &= 60+5&& \\[1 em]15a &= 65&& \text{ divide both sides by $ 15 $ } \\[1 em]a &= \frac{65}{15}&& \\[1 em]a &= \frac{13}{3}&& \\[1 em] \end{aligned} $$
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