$$[\frac{-2}{3}+\frac{3}{5})+(\frac{5}{6})$$
$\frac{23}{30}\approx 0.766666667$
$$-\frac{2}{3}+\frac{3}{5}+\frac{5}{6}$$
$$-\frac{10}{15}+\frac{9}{15}+\frac{5}{6}$$
$$\frac{-10+9}{15}+\frac{5}{6}$$
$$-\frac{1}{15}+\frac{5}{6}$$
$$-\frac{2}{30}+\frac{25}{30}$$
$$\frac{-2+25}{30}$$
$$\frac{23}{30}$$
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$\frac{23}{2 \cdot 3 \cdot 5} = 0.7666666666666667$
