Tomamos como el límite
$$\lim_{x \to -1^+}\left(\frac{6 x^{2} + \left(x^{3} - 7\right)}{- x + \left(x^{2} + 4\right)}\right)$$
cambiamos
$$\lim_{x \to -1^+}\left(\frac{6 x^{2} + \left(x^{3} - 7\right)}{- x + \left(x^{2} + 4\right)}\right)$$
=
$$\lim_{x \to -1^+}\left(\frac{\left(x - 1\right) \left(x^{2} + 7 x + 7\right)}{x^{2} - x + 4}\right)$$
=
$$\lim_{x \to -1^+}\left(\frac{x^{3} + 6 x^{2} - 7}{x^{2} - x + 4}\right) = $$
$$\frac{-7 + \left(-1\right)^{3} + 6 \left(-1\right)^{2}}{\left(-1\right)^{2} - -1 + 4} = $$
= -1/3
Entonces la respuesta definitiva es:
$$\lim_{x \to -1^+}\left(\frac{6 x^{2} + \left(x^{3} - 7\right)}{- x + \left(x^{2} + 4\right)}\right) = - \frac{1}{3}$$