Question
$$\frac{3}{4}b\cdot15 = 0$$
Answer
$$ b = 0 $$
Explanation
$$ \begin{aligned} \frac{3}{4}b\cdot15 &= 0&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{3}{4}b\cdot15 &= 4\cdot0&& \text{cancel out the denominators} \\[1 em]45b &= 0&& \text{ divide both sides by $ 45 $ } \\[1 em]b &= \frac{0}{45}&& \\[1 em]b &= 0&& \\[1 em] \end{aligned} $$
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