$$\lim_{x\to0}\left(1+\frac{8}{x}\right)^x$$

$$x^2-72x+80$$

$$\int\:\frac{s^2}{s+6}ds$$

$$\frac{dy}{dx}=x\left(1-y^2\right)$$

$$t=\left(t-8\right)$$

$$\left(20x-8y\right)-\left(13x+9y\right)$$

$$n\log a-\log b-\log c$$