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