Identify the horizontal and vertical asymptotes, if any,
of the given function.
f(x) = \frac{3 x^2 + 12 x + 9}{7 x^2 - 7 x - 84}
Separate multiple answers by commas.

Enter**DNE** if an asymptote does not exist.

Enter

- Horizontal asymptote(s):
y = - Vertical asymptote(s):
x =

You can earn partial credit on this problem.