$$11/13+4/3=$$
$\frac{85}{39}\approx 2.179487179$
$$\frac{33}{39}+\frac{52}{39}$$
$$\frac{33+52}{39}$$
$$\frac{85}{39}$$
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$\frac{5 \cdot 17}{3 \cdot 13} = 2\frac{7}{39} = 2.1794871794871793$