$$\frac{8m}{7}=\frac{2}{5}$$
$m=\frac{7}{20}=0.35$
$$8m=\frac{2}{5}\times 7$$
$$8m=\frac{2\times 7}{5}$$
$$8m=\frac{14}{5}$$
$$m=\frac{\frac{14}{5}}{8}$$
$$m=\frac{14}{5\times 8}$$
$$m=\frac{14}{40}$$
$$m=\frac{7}{20}$$
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