$$\frac{ 2 }{ 4 } - \frac{ 2 }{ 7 } =$$
$\frac{3}{14}\approx 0.214285714$
$$\frac{1}{2}-\frac{2}{7}$$
$$\frac{7}{14}-\frac{4}{14}$$
$$\frac{7-4}{14}$$
$$\frac{3}{14}$$
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$\frac{3}{2 \cdot 7} = 0.21428571428571427$