$$ \begin{aligned} \frac{x}{6}-5 &= 8&& \text{multiply ALL terms by } \color{blue}{ 6 }. \\[1 em]6 \cdot \frac{x}{6}-6\cdot5 &= 6\cdot8&& \text{cancel out the denominators} \\[1 em]x-30 &= 48&& \text{ move -30 to the right } \\[1 em]x &= 48+30&& \\[1 em]x &= 78&& \\[1 em]x &= 78&& \\[1 em] \end{aligned} $$
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