$$\frac { 3 } { 4 } - \frac { 5 } { 7 } + \frac { 9 } { 14 }$$
$\frac{19}{28}\approx 0.678571429$
$$\frac{21}{28}-\frac{20}{28}+\frac{9}{14}$$
$$\frac{21-20}{28}+\frac{9}{14}$$
$$\frac{1}{28}+\frac{9}{14}$$
$$\frac{1}{28}+\frac{18}{28}$$
$$\frac{1+18}{28}$$
$$\frac{19}{28}$$
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$\frac{19}{2 ^ {2} \cdot 7} = 0.6785714285714286$
