$$\frac{-2}{3}+(-\frac{1}{2}+\frac{2}{3})$$
$-\frac{1}{2}=-0.5$
$$-\frac{2}{3}-\frac{1}{2}+\frac{2}{3}$$
$$-\frac{4}{6}-\frac{3}{6}+\frac{2}{3}$$
$$\frac{-4-3}{6}+\frac{2}{3}$$
$$-\frac{7}{6}+\frac{2}{3}$$
$$-\frac{7}{6}+\frac{4}{6}$$
$$\frac{-7+4}{6}$$
$$\frac{-3}{6}$$
$$-\frac{1}{2}$$
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$-\frac{1}{2} = -0.5$
