$$\frac{2}{5}\times\frac{3}{8}+\frac{3}{8}\times\frac{2}{7}-\frac{1}{7}$$
$\frac{4}{35}\approx 0.114285714$
$$\frac{2\times 3}{5\times 8}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{6}{40}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{3}{20}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{3}{20}+\frac{3\times 2}{8\times 7}-\frac{1}{7}$$
$$\frac{3}{20}+\frac{6}{56}-\frac{1}{7}$$
$$\frac{3}{20}+\frac{3}{28}-\frac{1}{7}$$
$$\frac{21}{140}+\frac{15}{140}-\frac{1}{7}$$
$$\frac{21+15}{140}-\frac{1}{7}$$
$$\frac{36}{140}-\frac{1}{7}$$
$$\frac{9}{35}-\frac{1}{7}$$
$$\frac{9}{35}-\frac{5}{35}$$
$$\frac{9-5}{35}$$
$$\frac{4}{35}$$
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$\frac{2 ^ {2}}{5 \cdot 7} = 0.11428571428571428$
