$$4 \frac { 1 } { 3 } + \frac{ 2 }{ 7 } - \frac{ 5 }{ 8 }$$
$\frac{671}{168}\approx 3.994047619$
$$\frac{12+1}{3}+\frac{2}{7}-\frac{5}{8}$$
$$\frac{13}{3}+\frac{2}{7}-\frac{5}{8}$$
$$\frac{91}{21}+\frac{6}{21}-\frac{5}{8}$$
$$\frac{91+6}{21}-\frac{5}{8}$$
$$\frac{97}{21}-\frac{5}{8}$$
$$\frac{776}{168}-\frac{105}{168}$$
$$\frac{776-105}{168}$$
$$\frac{671}{168}$$
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$\frac{11 \cdot 61}{2 ^ {3} \cdot 3 \cdot 7} = 3\frac{167}{168} = 3.994047619047619$
