Question
$$\frac{45}{15} = \frac{20}{x}$$
Answer
$$ x = \dfrac{20}{3} $$
Explanation
$$ \begin{aligned} \frac{45}{15} &= \frac{20}{x}&& \text{multiply ALL terms by } \color{blue}{ 15x }. \\[1 em]15x\cdot\frac{45}{15} &= 15x\cdot\frac{20}{x}&& \text{cancel out the denominators} \\[1 em]45x &= 300&& \text{ divide both sides by $ 45 $ } \\[1 em]x &= \frac{300}{45}&& \\[1 em]x &= \frac{20}{3}&& \\[1 em] \end{aligned} $$
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