$$ \begin{aligned} x-\frac{1}{5}x &= 2000&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5x-5 \cdot \frac{1}{5}x &= 5\cdot2000&& \text{cancel out the denominators} \\[1 em]5x-x &= 10000&& \text{simplify left side} \\[1 em]4x &= 10000&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{10000}{4}&& \\[1 em]x &= 2500&& \\[1 em] \end{aligned} $$

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