$$\frac{ 8 }{ 7 } - \frac{ 4 }{ 7 }$$
$\frac{4}{7}\approx 0.571428571$
$$\frac{8-4}{7}$$
$$\frac{4}{7}$$
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$\frac{2 ^ {2}}{7} = 0.5714285714285714$
