Answer
$\frac{3}{14}$
Work Step by Step
LCD is 14.
$\frac{9}{14}-\frac{3}{7}=\frac{9}{14}-\frac{3\times2}{7\times2}=\frac{9}{14}-\frac{6}{14}=\frac{9-6}{14}=\frac{3}{14}$
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