$$ \begin{aligned} \frac{4}{16}x\cdot100 &= 0&& \text{multiply ALL terms by } \color{blue}{ 16 }. \\[1 em]16 \cdot \frac{4}{16}x\cdot100 &= 16\cdot0&& \text{cancel out the denominators} \\[1 em]400x &= 0&& \text{ divide both sides by $ 400 $ } \\[1 em]x &= \frac{0}{400}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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