Find the derivative of the following function.

$y=ln(8x^3-7x)-4x$

$\frac{24x^2-7}{8x^3-7x}$

$\frac{8x^2-7}{8x^3-7x}-4$

$\frac{24x^2-7}{8x^3-7x}-4$

$\frac{8}{8x^3-7x}-4$

$\frac{7}{8x^2-7}-4$