$$\frac { 18 } { 7 } - \frac { 1 } { 14 } + \frac { 16 } { 21 } + ( \frac { - 19 } { 28 } )$$
$\frac{31}{12}\approx 2.583333333$
$$\frac{36}{14}-\frac{1}{14}+\frac{16}{21}+\frac{-19}{28}$$
$$\frac{36-1}{14}+\frac{16}{21}+\frac{-19}{28}$$
$$\frac{35}{14}+\frac{16}{21}+\frac{-19}{28}$$
$$\frac{5}{2}+\frac{16}{21}+\frac{-19}{28}$$
$$\frac{105}{42}+\frac{32}{42}+\frac{-19}{28}$$
$$\frac{105+32}{42}+\frac{-19}{28}$$
$$\frac{137}{42}+\frac{-19}{28}$$
$$\frac{137}{42}-\frac{19}{28}$$
$$\frac{274}{84}-\frac{57}{84}$$
$$\frac{274-57}{84}$$
$$\frac{217}{84}$$
$$\frac{31}{12}$$
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$\frac{31}{2 ^ {2} \cdot 3} = 2\frac{7}{12} = 2.5833333333333335$
