$\frac{-2}{5}-\frac{-3}{10}-\frac{-4}{7}$
Taking the LCM of the denominators:
$\frac{-28}{70}-\frac{-21}{70}-\frac{-40}{70}$
$=\frac{(-28)-(-21)-(-40)}{70}$
$=\frac{-28+21+40}{70}$
$=\frac{33}{70}$
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