Question
$$\frac{u}{6} = \frac{3}{9}$$
Answer
$$ u = 2 $$
Explanation
$$ \begin{aligned} \frac{u}{6} &= \frac{3}{9}&& \text{multiply ALL terms by } \color{blue}{ 18 }. \\[1 em]18 \cdot \frac{u}{6} &= 18\cdot\frac{3}{9}&& \text{cancel out the denominators} \\[1 em]3u &= 6&& \text{ divide both sides by $ 3 $ } \\[1 em]u &= \frac{6}{3}&& \\[1 em]u &= 2&& \\[1 em] \end{aligned} $$
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