Answer
$ \frac{1}{2}$.
Work Step by Step
$\frac{2}{3} - \frac{1}{6} = \frac{2 \cdot 2}{3 \cdot 2} - \frac{1}{6} = \frac{4}{6} - \frac{1}{6} = \frac{4-1}{6} = \frac{3}{6} = \frac{1}{2}$.
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