$$(-5/6)-(-7/8)-(-4/8)$$
$\frac{13}{24}\approx 0.541666667$
$$-\frac{5}{6}-\frac{-7}{8}-\frac{-4}{8}$$
$$-\frac{5}{6}-\left(-\frac{7}{8}\right)-\frac{-4}{8}$$
$$-\frac{5}{6}+\frac{7}{8}-\frac{-4}{8}$$
$$-\frac{20}{24}+\frac{21}{24}-\frac{-4}{8}$$
$$\frac{-20+21}{24}-\frac{-4}{8}$$
$$\frac{1}{24}-\frac{-4}{8}$$
$$\frac{1}{24}-\left(-\frac{1}{2}\right)$$
$$\frac{1}{24}+\frac{1}{2}$$
$$\frac{1}{24}+\frac{12}{24}$$
$$\frac{1+12}{24}$$
$$\frac{13}{24}$$
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$\frac{13}{2 ^ {3} \cdot 3} = 0.5416666666666666$
