Question
$$18 \cdot \frac{d}{9} = 0$$
Answer
$$ d = 0 $$
Explanation
$$ \begin{aligned} 18 \cdot \frac{d}{9} &= 0&& \text{multiply ALL terms by } \color{blue}{ 9 }. \\[1 em]9\cdot18 \cdot \frac{d}{9} &= 9\cdot0&& \text{cancel out the denominators} \\[1 em]18d &= 0&& \text{ divide both sides by $ 18 $ } \\[1 em]d &= \frac{0}{18}&& \\[1 em]d &= 0&& \\[1 em] \end{aligned} $$
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