$$\frac{-2}{5}-\frac{-3}{10}-\frac{-4}{7}$$
$\frac{33}{70}\approx 0.471428571$
$$-\frac{2}{5}-\frac{-3}{10}-\frac{-4}{7}$$
$$-\frac{2}{5}-\left(-\frac{3}{10}\right)-\frac{-4}{7}$$
$$-\frac{2}{5}+\frac{3}{10}-\frac{-4}{7}$$
$$-\frac{4}{10}+\frac{3}{10}-\frac{-4}{7}$$
$$\frac{-4+3}{10}-\frac{-4}{7}$$
$$-\frac{1}{10}-\frac{-4}{7}$$
$$-\frac{1}{10}-\left(-\frac{4}{7}\right)$$
$$-\frac{1}{10}+\frac{4}{7}$$
$$-\frac{7}{70}+\frac{40}{70}$$
$$\frac{-7+40}{70}$$
$$\frac{33}{70}$$
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$\frac{3 \cdot 11}{2 \cdot 5 \cdot 7} = 0.4714285714285714$
