$$ \begin{aligned} e-\frac{48}{30} &= 0&& \text{multiply ALL terms by } \color{blue}{ 30 }. \\[1 em]30e-30\cdot\frac{48}{30} &= 30\cdot0&& \text{cancel out the denominators} \\[1 em]30e-48 &= 0&& \text{ move the constants to the right } \\[1 em]30e &= 48&& \text{ divide both sides by $ 30 $ } \\[1 em]e &= \frac{48}{30}&& \\[1 em]e &= \frac{8}{5}&& \\[1 em] \end{aligned} $$

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