Question
$$\frac{u}{3}-3 = 5$$
Answer
$$ u = 24 $$
Explanation
$$ \begin{aligned} \frac{u}{3}-3 &= 5&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{u}{3}-3\cdot3 &= 3\cdot5&& \text{cancel out the denominators} \\[1 em]u-9 &= 15&& \text{ move -9 to the right } \\[1 em]u &= 15+9&& \\[1 em]u &= 24&& \\[1 em]u &= 24&& \\[1 em] \end{aligned} $$
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