$$84x\cdot900+84 = 84x\cdot248+84$$

$$ \begin{aligned} 84x\cdot900+84 &= 84x\cdot248+84&& \text{move the $ \color{blue}{ 20832x } $ to the left side and $ \color{blue}{ 84 }$ to the right} \\[1 em]75600x-20832x &= 84-84&& \text{simplify left and right hand side} \\[1 em]54768x &= 0&& \text{ divide both sides by $ 54768 $ } \\[1 em]x &= \frac{0}{54768}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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