Question
$$5 \cdot \frac{x^2}{50}x = 9$$
Answer
$$ x = 90 $$
Explanation
$$ \begin{aligned} 5 \cdot \frac{x^2}{50}x &= 9&& \text{multiply ALL terms by } \color{blue}{ 50 }. \\[1 em]505 \cdot \frac{x^2}{50}x &= 50\cdot9&& \text{cancel out the denominators} \\[1 em]5x &= 450&& \text{ divide both sides by $ 5 $ } \\[1 em]x &= \frac{450}{5}&& \\[1 em]x &= 90&& \\[1 em] \end{aligned} $$
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