Find a possible formula for the function graphed below. The $x$-intercepts are marked with points located at $(5, 0)$ and $(-4, 0)$, while the $y$-intercept is marked with a point located at $\left( 0, -\frac{5}{3} \right)$. The asymptotes are $y = -1$, $x = -3$, and $x = 4$. Give your formula as a reduced rational function.

$f(x) =$ help (formulas)