Question
$$2 \cdot \frac{x}{4} = 20$$
Answer
$$ x = 40 $$
Explanation
$$ \begin{aligned} 2 \cdot \frac{x}{4} &= 20&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot2 \cdot \frac{x}{4} &= 4\cdot20&& \text{cancel out the denominators} \\[1 em]2x &= 80&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{80}{2}&& \\[1 em]x &= 40&& \\[1 em] \end{aligned} $$
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