$$4- \frac{ 22 }{ 7 }$$
$\frac{6}{7}\approx 0.857142857$
$$\frac{28}{7}-\frac{22}{7}$$
$$\frac{28-22}{7}$$
$$\frac{6}{7}$$
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$\frac{2 \cdot 3}{7} = 0.8571428571428571$
