$$\frac { 5 } { 6 } - \frac { 7 } { 8 } + \frac { 11 } { 12 }$$
$\frac{7}{8}=0.875$
$$\frac{20}{24}-\frac{21}{24}+\frac{11}{12}$$
$$\frac{20-21}{24}+\frac{11}{12}$$
$$-\frac{1}{24}+\frac{11}{12}$$
$$-\frac{1}{24}+\frac{22}{24}$$
$$\frac{-1+22}{24}$$
$$\frac{21}{24}$$
$$\frac{7}{8}$$
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$\frac{7}{2 ^ {3}} = 0.875$
