$$20/7+27/3$$
$\frac{83}{7}\approx 11.857142857$
$$\frac{20}{7}+9$$
$$\frac{20}{7}+\frac{63}{7}$$
$$\frac{20+63}{7}$$
$$\frac{83}{7}$$
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$\frac{83}{7} = 11\frac{6}{7} = 11.857142857142858$