$$\frac{4z}{z^2\left(z^2+7\right)}$$

$$\frac{dy}{dx}y=\frac{2x^2}{3}+\sqrt{x-1}$$

$$\left(t^3+4v^2\right)^2$$

$$5x-4=21$$

$$\int\frac{\left(x-5\right)^3}{x^{\frac{2}{5}}}dx$$

$$\frac{x^3}{2-x}$$

$$-4-\left(5-7\right)-\left(4+5\right)$$