$$ \begin{aligned} 75 &= \frac{24000}{x}&& \text{multiply ALL terms by } \color{blue}{ x }. \\[1 em]x\cdot75 &= x\cdot\frac{24000}{x}&& \text{cancel out the denominators} \\[1 em]75x &= 24000&& \text{ divide both sides by $ 75 $ } \\[1 em]x &= \frac{24000}{75}&& \\[1 em]x &= 320&& \\[1 em] \end{aligned} $$
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