Evaluate the following limits. If needed, enter 'INF' for $\infty$ and '-INF' for $-\infty$.

(a) $$\lim_{ x \rightarrow \infty } \frac {( 4 - x)( 7 + 3 x) }{ (3 - 9 x )( 11 + 7 x ) } =$$

(b) $$\lim_{ x \rightarrow -\infty } \frac {( 4 - x)( 7 + 3 x) }{ (3 - 9 x )( 11 + 7 x ) } =$$