$$\frac { 3 } { 7 } + \frac { 1 } { 2 } - \frac { 1 } { 14 }$$
$\frac{6}{7}\approx 0.857142857$
$$\frac{6}{14}+\frac{7}{14}-\frac{1}{14}$$
$$\frac{6+7}{14}-\frac{1}{14}$$
$$\frac{13}{14}-\frac{1}{14}$$
$$\frac{13-1}{14}$$
$$\frac{12}{14}$$
$$\frac{6}{7}$$
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$\frac{2 \cdot 3}{7} = 0.8571428571428571$