$$ \begin{aligned} 6 \cdot \frac{g}{15} &= 5&& \text{multiply ALL terms by } \color{blue}{ 15 }. \\[1 em]15\cdot6 \cdot \frac{g}{15} &= 15\cdot5&& \text{cancel out the denominators} \\[1 em]6g &= 75&& \text{ divide both sides by $ 6 $ } \\[1 em]g &= \frac{75}{6}&& \\[1 em]g &= \frac{25}{2}&& \\[1 em] \end{aligned} $$
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