$$ \begin{aligned} \frac{3}{8}x\cdot10000 &= 0&& \text{multiply ALL terms by } \color{blue}{ 8 }. \\[1 em]8 \cdot \frac{3}{8}x\cdot10000 &= 8\cdot0&& \text{cancel out the denominators} \\[1 em]30000x &= 0&& \text{ divide both sides by $ 30000 $ } \\[1 em]x &= \frac{0}{30000}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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