$$- \frac{ 5 }{ 6 } + \frac{ 3 }{ 4 } + \frac{ 7 }{ 8 }$$
$\frac{19}{24}\approx 0.791666667$
$$-\frac{10}{12}+\frac{9}{12}+\frac{7}{8}$$
$$\frac{-10+9}{12}+\frac{7}{8}$$
$$-\frac{1}{12}+\frac{7}{8}$$
$$-\frac{2}{24}+\frac{21}{24}$$
$$\frac{-2+21}{24}$$
$$\frac{19}{24}$$
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$\frac{19}{2 ^ {3} \cdot 3} = 0.7916666666666666$
