\[\left( \frac{3x - 1}{x} \right)^{- 3} \cdot \left( x^{- 2} - 6x^{- 1} + 9 \right) =\]
\[= \frac{x^{3} \cdot \left( x^{- 2} - 6x^{- 1} + 9 \right)}{(3x - 1)(3x - 1)^{2}} =\]