$$ \begin{aligned} 7u &= \frac{14}{3}&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3\cdot7u &= 3\cdot\frac{14}{3}&& \text{cancel out the denominators} \\[1 em]21u &= 14&& \text{ divide both sides by $ 21 $ } \\[1 em]u &= \frac{14}{21}&& \\[1 em]u &= \frac{2}{3}&& \\[1 em] \end{aligned} $$
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