$$84x\cdot\frac{900}{84} = 84x\cdot\frac{248}{84}$$

$$ \begin{aligned} 84x\cdot\frac{900}{84} &= 84x\cdot\frac{248}{84}&& \text{multiply ALL terms by } \color{blue}{ 84 }. \\[1 em]8484x\cdot\frac{900}{84} &= 8484x\cdot\frac{248}{84}&& \text{cancel out the denominators} \\[1 em]75600x &= 20832x&& \text{move the $ \color{blue}{ 20832x } $ to the left side} \\[1 em]75600x-20832x &= 0&& \text{simplify left side} \\[1 em]54768x &= 0&& \text{ divide both sides by $ 54768 $ } \\[1 em]x &= \frac{0}{54768}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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