$$7\frac{6}{13}-3\frac{4}{26}=$$
$\frac{56}{13}\approx 4.307692308$
$$\frac{91+6}{13}-\frac{3\times 26+4}{26}$$
$$\frac{97}{13}-\frac{3\times 26+4}{26}$$
$$\frac{97}{13}-\frac{78+4}{26}$$
$$\frac{97}{13}-\frac{82}{26}$$
$$\frac{97}{13}-\frac{41}{13}$$
$$\frac{97-41}{13}$$
$$\frac{56}{13}$$
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$\frac{2 ^ {3} \cdot 7}{13} = 4\frac{4}{13} = 4.3076923076923075$
