$$\lim_{x\to2}\left(\frac{8x^3-1}{2x-1}\right)$$

$$\int^32x^2xdx$$

$$\int\sqrt{n}dn$$

$$2^{\left(2x+2\right)}\:-17\:\cdot\:2^x\:+\:4\:=\:0$$

$$-15-12y+19-4$$

$$5a^4+3a^2+a^4+4a^2$$

$$x+x-x+y+y-z+z-z$$