$$(\frac{2}{5}+\frac{3}{5})\times(\frac{6}{7}-\frac{5}{14})=$$
$\frac{1}{2}=0.5$
$$\frac{2+3}{5}\left(\frac{6}{7}-\frac{5}{14}\right)$$
$$\frac{5}{5}\left(\frac{6}{7}-\frac{5}{14}\right)$$
$$1\left(\frac{6}{7}-\frac{5}{14}\right)$$
$$1\left(\frac{12}{14}-\frac{5}{14}\right)$$
$$1\times \frac{12-5}{14}$$
$$1\times \frac{7}{14}$$
$$1\times \frac{1}{2}$$
$$\frac{1}{2}$$
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$\frac{1}{2} = 0.5$
