$$\frac{ 8 }{ 7 } -2$$
$-\frac{6}{7}\approx -0.857142857$
$$\frac{8}{7}-\frac{14}{7}$$
$$\frac{8-14}{7}$$
$$-\frac{6}{7}$$
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$-\frac{6}{7} = -0.8571428571428571$
