$$ \begin{aligned} \frac{8}{n} &= 2&& \text{multiply ALL terms by } \color{blue}{ n }. \\[1 em]n\cdot\frac{8}{n} &= n\cdot2&& \text{cancel out the denominators} \\[1 em]8 &= 2n&& \text{ swap the left and right side of the equation } \\[1 em]2n &= 8&& \text{ divide both sides by $ 2 $ } \\[1 em]n &= \frac{8}{2}&& \\[1 em]n &= 4&& \\[1 em] \end{aligned} $$

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