Find the horizontal limit(s) of the following function:

$\displaystyle f(x) = \frac{4x^{3}-7x^{2}-3x}{9-11x-7x^{3}}$

$\displaystyle \lim_{x->-\infty} f(x) =$ ,

$\displaystyle \lim_{x->\infty} f(x) =$