$$ \begin{aligned} \frac{1000000}{x} &= 20000&& \text{multiply ALL terms by } \color{blue}{ x }. \\[1 em]x\cdot\frac{1000000}{x} &= x\cdot20000&& \text{cancel out the denominators} \\[1 em]1000000 &= 20000x&& \text{ swap the left and right side of the equation } \\[1 em]20000x &= 1000000&& \text{ divide both sides by $ 20000 $ } \\[1 em]x &= \frac{1000000}{20000}&& \\[1 em]x &= 50&& \\[1 em] \end{aligned} $$

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