$$\frac{-4}{7}+\frac{5}{14}-\frac{9}{14}+\frac{2}{14}$$
$-\frac{5}{7}\approx -0.714285714$
$$-\frac{4}{7}+\frac{5}{14}-\frac{9}{14}+\frac{2}{14}$$
$$-\frac{8}{14}+\frac{5}{14}-\frac{9}{14}+\frac{2}{14}$$
$$\frac{-8+5}{14}-\frac{9}{14}+\frac{2}{14}$$
$$-\frac{3}{14}-\frac{9}{14}+\frac{2}{14}$$
$$\frac{-3-9}{14}+\frac{2}{14}$$
$$\frac{-12}{14}+\frac{2}{14}$$
$$-\frac{6}{7}+\frac{2}{14}$$
$$-\frac{6}{7}+\frac{1}{7}$$
$$\frac{-6+1}{7}$$
$$-\frac{5}{7}$$
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$-\frac{5}{7} = -0.7142857142857143$
