Simplify \( \frac{a}{9a^2 - b^2} + \frac{1}{3a - b}\):

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3 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Simplify \( \frac{a}{9a^2 - b^2} + \frac{1}{3a - b}\):

\( \frac{4a - b}{9a^2 - b^2} \)

\( \frac{4a}{9a^2 - b^2} \)

\( \frac{a}{9a^2 - b^2} \)

\( \frac{b}{9a^2 - b^2} \)