$$2/5 \times 3/7-1/14-3/7 \times 3/5$$
$-\frac{11}{70}\approx -0.157142857$
$$\frac{\frac{2\times 3}{5}}{7}-\frac{1}{14}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{\frac{6}{5}}{7}-\frac{1}{14}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{6}{5\times 7}-\frac{1}{14}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{6}{35}-\frac{1}{14}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{12}{70}-\frac{5}{70}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{12-5}{70}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{7}{70}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{1}{10}-\frac{\frac{3}{7}\times 3}{5}$$
$$\frac{1}{10}-\frac{\frac{3\times 3}{7}}{5}$$
$$\frac{1}{10}-\frac{\frac{9}{7}}{5}$$
$$\frac{1}{10}-\frac{9}{7\times 5}$$
$$\frac{1}{10}-\frac{9}{35}$$
$$\frac{7}{70}-\frac{18}{70}$$
$$\frac{7-18}{70}$$
$$-\frac{11}{70}$$
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$-\frac{11}{70} = -0.15714285714285714$
