$$ \begin{aligned} \frac{41}{2}x\cdot\frac{21}{5} &= 0&& \text{multiply ALL terms by } \color{blue}{ 10 }. \\[1 em]10 \cdot \frac{41}{2}x\cdot\frac{21}{5} &= 10\cdot0&& \text{cancel out the denominators} \\[1 em]861x &= 0&& \text{ divide both sides by $ 861 $ } \\[1 em]x &= \frac{0}{861}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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