$$4-\frac{3}{7}\Rightarrow$$
$\frac{25}{7}\approx 3.571428571$
$$\frac{28}{7}-\frac{3}{7}$$
$$\frac{28-3}{7}$$
$$\frac{25}{7}$$
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$\frac{5 ^ {2}}{7} = 3\frac{4}{7} = 3.5714285714285716$