$$\frac{9}{7}-\frac{3}{6}$$
$\frac{11}{14}\approx 0.785714286$
$$\frac{9}{7}-\frac{1}{2}$$
$$\frac{18}{14}-\frac{7}{14}$$
$$\frac{18-7}{14}$$
$$\frac{11}{14}$$
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$\frac{11}{2 \cdot 7} = 0.7857142857142857$