$$ \begin{aligned} \frac{n}{320} &= \frac{8}{3}&& \text{multiply ALL terms by } \color{blue}{ 960 }. \\[1 em]960 \cdot \frac{n}{320} &= 960\cdot\frac{8}{3}&& \text{cancel out the denominators} \\[1 em]3n &= 2560&& \text{ divide both sides by $ 3 $ } \\[1 em]n &= \frac{2560}{3}&& \\[1 em] \end{aligned} $$
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