$$\frac{6420}{968}\div\frac{548}{624}\div\frac{698}{725}$$
$\frac{45381375}{5785373}\approx 7.844157153$
$$\frac{\frac{6420}{968}\times 725}{\frac{548}{624}\times 698}$$
$$\frac{\frac{1605}{242}\times 725}{\frac{548}{624}\times 698}$$
$$\frac{\frac{1605\times 725}{242}}{\frac{548}{624}\times 698}$$
$$\frac{\frac{1163625}{242}}{\frac{548}{624}\times 698}$$
$$\frac{\frac{1163625}{242}}{\frac{137}{156}\times 698}$$
$$\frac{\frac{1163625}{242}}{\frac{137\times 698}{156}}$$
$$\frac{\frac{1163625}{242}}{\frac{95626}{156}}$$
$$\frac{\frac{1163625}{242}}{\frac{47813}{78}}$$
$$\frac{1163625}{242}\times \frac{78}{47813}$$
$$\frac{1163625\times 78}{242\times 47813}$$
$$\frac{90762750}{11570746}$$
$$\frac{45381375}{5785373}$$
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$\frac{3 ^ {2} \cdot 5 ^ {3} \cdot 13 \cdot 29 \cdot 107}{11 ^ {2} \cdot 137 \cdot 349} = 7\frac{4883764}{5785373} = 7.844157152875018$