Since they have the same base, we can add the exponents. We have $\frac{1}{3}$ and $-\frac{1}{4}$, but we need a common denominator to add them. The common denominator is 12. So, we rewrite $\frac{1}{3}$ as $\frac{4}{12}$ and $-\frac{1}{4}$ as $-\frac{3}{12}$.
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