$$- \frac{ 3 }{ 7 } + \frac{ 2 }{ 7 } +( \frac{ -1 }{ 7 } )$$
$-\frac{2}{7}\approx -0.285714286$
$$\frac{-3+2}{7}+\frac{-1}{7}$$
$$-\frac{1}{7}+\frac{-1}{7}$$
$$-\frac{1}{7}-\frac{1}{7}$$
$$\frac{-1-1}{7}$$
$$-\frac{2}{7}$$
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$-\frac{2}{7} = -0.2857142857142857$
