$$7x^2+54x+124=4x^2+30x+79$$

$$2x^2-2x-4=0$$

$$\frac{2-2}{3}+2\:3$$

$$\left(2r\:-\:3\right)\left(r\:+\:3\right)$$

$$\lim_{x\to3}\left(\frac{\left|3-s\right|}{3-s}\right)$$

$$-825\cdot\:-3313$$

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