$$ \begin{aligned} q-\frac{80}{6} &= 0&& \text{multiply ALL terms by } \color{blue}{ 6 }. \\[1 em]6q-6\cdot\frac{80}{6} &= 6\cdot0&& \text{cancel out the denominators} \\[1 em]6q-80 &= 0&& \text{ move the constants to the right } \\[1 em]6q &= 80&& \text{ divide both sides by $ 6 $ } \\[1 em]q &= \frac{80}{6}&& \\[1 em]q &= \frac{40}{3}&& \\[1 em] \end{aligned} $$

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