$$\frac{15}{28}x = \frac{9}{10}$$
Answer
$$ x = \frac{42}{25} $$
Explanation
$$ \begin{aligned} \frac{15}{28}x &= \frac{9}{10}&& \text{multiply ALL terms by } \color{blue}{ 140 }. \\[1 em]140 \cdot \frac{15}{28}x &= 140\cdot\frac{9}{10}&& \text{cancel out the denominators} \\[1 em]75x &= 126&& \text{ divide both sides by $ 75 $ } \\[1 em]x &= \frac{126}{75}&& \\[1 em]x &= \frac{42}{25}&& \\[1 em] \end{aligned} $$
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