Can you answer in 15 seconds? (Part 1)

Algebra Level 2

\[ \huge 27^{- \frac {x}{3} } + 81^{ \frac {1-x}{4} } \]

If the expression above can be stated in the form of \( \dfrac {a}{b^x} \) for positive integers \(a\) and \(b\), what is the value of \(a+b\)?

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