$$ \begin{aligned} 104 \cdot \frac{x}{100} &= \frac{8}{10}&& \text{multiply ALL terms by } \color{blue}{ 100 }. \\[1 em]100\cdot104 \cdot \frac{x}{100} &= 100\cdot\frac{8}{10}&& \text{cancel out the denominators} \\[1 em]104x &= 80&& \text{ divide both sides by $ 104 $ } \\[1 em]x &= \frac{80}{104}&& \\[1 em]x &= \frac{10}{13}&& \\[1 em] \end{aligned} $$

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