$$13=7+z$$

$$\left(2y^5+13x^3\right)^2$$

$$9+\frac{6}{8-2}$$

$$\int_0^{\frac{3}{2}}\frac{1}{\left(x+2\right)\left(x-2\right)}dx$$

$$\left(p+9\right)\left(p-12\right)$$

$$\lim_{x\to0}\left(\frac{2x^2-x^3}{x^5-2x^2}\right)$$