$$\frac{3}{7}+1/4}+\frac{3}{28}$$
$\frac{19}{28}\approx 0.678571429$
$$\frac{12}{28}+\frac{7}{28}$$
$$\frac{12+7}{28}$$
$$\frac{19}{28}$$
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$\frac{19}{2 ^ {2} \cdot 7} = 0.6785714285714286$