Question
$$\frac{2}{6} = \frac{4}{x}$$
Answer
$$ x = 12 $$
Explanation
$$ \begin{aligned} \frac{2}{6} &= \frac{4}{x}&& \text{multiply ALL terms by } \color{blue}{ 6x }. \\[1 em]6x\cdot\frac{2}{6} &= 6x\cdot\frac{4}{x}&& \text{cancel out the denominators} \\[1 em]2x &= 24&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{24}{2}&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$
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