$$4 - 1 \frac { 1 } { 7 }$$
$\frac{20}{7}\approx 2.857142857$
$$4-\frac{7+1}{7}$$
$$4-\frac{8}{7}$$
$$\frac{28}{7}-\frac{8}{7}$$
$$\frac{28-8}{7}$$
$$\frac{20}{7}$$
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$\frac{2 ^ {2} \cdot 5}{7} = 2\frac{6}{7} = 2.857142857142857$
