$$2/5 \times -3/7-1/4-3/7 \times 3/5$$
$-\frac{19}{28}\approx -0.678571429$
$$\frac{\frac{2\left(-3\right)}{5}}{7}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{\frac{-6}{5}}{7}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{-\frac{6}{5}}{7}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{-6}{5\times 7}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{-6}{35}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$-\frac{6}{35}-\frac{1}{4}-\frac{\frac{3}{7}\times 3}{5}$$
$$-\frac{24}{140}-\frac{35}{140}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{-24-35}{140}-\frac{\frac{3}{7}\times 3}{5}$$
$$-\frac{59}{140}-\frac{\frac{3}{7}\times 3}{5}$$
$$-\frac{59}{140}-\frac{\frac{3\times 3}{7}}{5}$$
$$-\frac{59}{140}-\frac{\frac{9}{7}}{5}$$
$$-\frac{59}{140}-\frac{9}{7\times 5}$$
$$-\frac{59}{140}-\frac{9}{35}$$
$$-\frac{59}{140}-\frac{36}{140}$$
$$\frac{-59-36}{140}$$
$$\frac{-95}{140}$$
$$-\frac{19}{28}$$
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$-\frac{19}{28} = -0.6785714285714286$
