Question
$$2 \cdot \frac{b}{5} = 4$$
Answer
$$ b = 10 $$
Explanation
$$ \begin{aligned} 2 \cdot \frac{b}{5} &= 4&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot2 \cdot \frac{b}{5} &= 5\cdot4&& \text{cancel out the denominators} \\[1 em]2b &= 20&& \text{ divide both sides by $ 2 $ } \\[1 em]b &= \frac{20}{2}&& \\[1 em]b &= 10&& \\[1 em] \end{aligned} $$
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