$$ \begin{aligned} \frac{3}{6} &= \frac{u}{8}&& \text{multiply ALL terms by } \color{blue}{ 24 }. \\[1 em]24\cdot\frac{3}{6} &= 24 \cdot \frac{u}{8}&& \text{cancel out the denominators} \\[1 em]12 &= 3u&& \text{ swap the left and right side of the equation } \\[1 em]3u &= 12&& \text{ divide both sides by $ 3 $ } \\[1 em]u &= \frac{12}{3}&& \\[1 em]u &= 4&& \\[1 em] \end{aligned} $$

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