$$\frac{2}{3}-\frac{7}{6}+\frac{1}{2}$$
$0$
$$\frac{4}{6}-\frac{7}{6}+\frac{1}{2}$$
$$\frac{4-7}{6}+\frac{1}{2}$$
$$\frac{-3}{6}+\frac{1}{2}$$
$$-\frac{1}{2}+\frac{1}{2}$$
$$0$$
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