$$\frac{5}{6}-\frac{7}{30}\times\frac{3}{28}$$
$\frac{97}{120}\approx 0.808333333$
$$\frac{5}{6}-\frac{7\times 3}{30\times 28}$$
$$\frac{5}{6}-\frac{21}{840}$$
$$\frac{5}{6}-\frac{1}{40}$$
$$\frac{100}{120}-\frac{3}{120}$$
$$\frac{100-3}{120}$$
$$\frac{97}{120}$$
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$\frac{97}{2 ^ {3} \cdot 3 \cdot 5} = 0.8083333333333333$