"One-third of a number" can be written as $\frac{x}{3}$, "is" means equals, "2 greater than" means we're going to add 2 to something, and "one-sixth of the same number" can be written as $\frac{x}{6}$. So, the equation becomes:
\[ \frac{x}{3} = \frac{x}{6} + 2 \]
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