$$\frac{2}{7}+\frac{1}{6}=$$
$\frac{19}{42}\approx 0.452380952$
$$\frac{12}{42}+\frac{7}{42}$$
$$\frac{12+7}{42}$$
$$\frac{19}{42}$$
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$\frac{19}{2 \cdot 3 \cdot 7} = 0.4523809523809524$