$$84+9x\cdot90 = 84+2x\cdot48$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} 84+9x\cdot90 &= 84+2x\cdot48&& \text{move the $ \color{blue}{ 96x } $ to the left side and $ \color{blue}{ 84 }$ to the right} \\[1 em]810x-96x &= 84-84&& \text{simplify left and right hand side} \\[1 em]714x &= 0&& \text{ divide both sides by $ 714 $ } \\[1 em]x &= \frac{0}{714}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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