$$6\frac{1}{12}-4\frac{4}{26}=$$
$\frac{301}{156}\approx 1.929487179$
$$\frac{72+1}{12}-\frac{4\times 26+4}{26}$$
$$\frac{73}{12}-\frac{4\times 26+4}{26}$$
$$\frac{73}{12}-\frac{104+4}{26}$$
$$\frac{73}{12}-\frac{108}{26}$$
$$\frac{73}{12}-\frac{54}{13}$$
$$\frac{949}{156}-\frac{648}{156}$$
$$\frac{949-648}{156}$$
$$\frac{301}{156}$$
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$\frac{7 \cdot 43}{2 ^ {2} \cdot 3 \cdot 13} = 1\frac{145}{156} = 1.9294871794871795$