$$\frac { 3 } { 4 } + \frac { 5 } { 6 } - \frac { ( - 7 ) } { 8 }$$
$\frac{59}{24}\approx 2.458333333$
$$\frac{9}{12}+\frac{10}{12}-\frac{-7}{8}$$
$$\frac{9+10}{12}-\frac{-7}{8}$$
$$\frac{19}{12}-\frac{-7}{8}$$
$$\frac{19}{12}-\left(-\frac{7}{8}\right)$$
$$\frac{19}{12}+\frac{7}{8}$$
$$\frac{38}{24}+\frac{21}{24}$$
$$\frac{38+21}{24}$$
$$\frac{59}{24}$$
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$\frac{59}{2 ^ {3} \cdot 3} = 2\frac{11}{24} = 2.4583333333333335$
