Answer
$\frac{3}{10}$
Work Step by Step
$\frac{7}{10}$+(-$\frac{2}{5}$)
$\frac{7}{10}$-($\frac{2\times2}{5\times2}$)
$\frac{7}{10}$-($\frac{4}{10}$)=$\frac{3}{10}$
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