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