$$\frac{ 2 }{ 5 } \times (- \frac{ 3 }{ 7 } )- \frac{ 1 }{ 6 } \times \frac{ 3 }{ 2 } + \frac{ 1 }{ 14 } \times \frac{ 2 }{ 5 }$$
$-\frac{11}{28}\approx -0.392857143$
$$\frac{2\left(-3\right)}{5\times 7}-\frac{1}{6}\times \frac{3}{2}+\frac{1}{14}\times \frac{2}{5}$$
$$\frac{-6}{35}-\frac{1}{6}\times \frac{3}{2}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{6}{35}-\frac{1}{6}\times \frac{3}{2}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{6}{35}-\frac{1\times 3}{6\times 2}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{6}{35}-\frac{3}{12}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{6}{35}-\frac{1}{4}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{24}{140}-\frac{35}{140}+\frac{1}{14}\times \frac{2}{5}$$
$$\frac{-24-35}{140}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{59}{140}+\frac{1}{14}\times \frac{2}{5}$$
$$-\frac{59}{140}+\frac{1\times 2}{14\times 5}$$
$$-\frac{59}{140}+\frac{2}{70}$$
$$-\frac{59}{140}+\frac{1}{35}$$
$$-\frac{59}{140}+\frac{4}{140}$$
$$\frac{-59+4}{140}$$
$$\frac{-55}{140}$$
$$-\frac{11}{28}$$
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$-\frac{11}{28} = -0.39285714285714285$
