Answer
$\frac{3}{4x}$
Work Step by Step
$\frac{\frac{5x}{7}}{\frac{20x^{2}}{21}}$
$=\frac{5x}{7}\div\frac{20x^{2}}{21}$
$=\frac{5x}{7}\times\frac{21}{20x^{2}}$
$=\frac{1}{1}\times\frac{3}{4x}$
$=\frac{3}{4x}$
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