$$ \begin{aligned} \frac{p}{8}-7 &= 6&& \text{multiply ALL terms by } \color{blue}{ 8 }. \\[1 em]8 \cdot \frac{p}{8}-8\cdot7 &= 8\cdot6&& \text{cancel out the denominators} \\[1 em]p-56 &= 48&& \text{ move -56 to the right } \\[1 em]p &= 48+56&& \\[1 em]p &= 104&& \\[1 em]p &= 104&& \\[1 em] \end{aligned} $$
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