Answer
$\frac{3}{10}$
Work Step by Step
The least common denominator is 10. Convert to like fractions and subtract.
$\frac{7}{10}-\frac{2}{5}$
=$\frac{7}{10}-\frac{2\times2}{5\times2}$
=$\frac{7}{10}-\frac{4}{10}$
=$\frac{3}{10}$
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