$\frac{3x+12+6+2x}{6}\:+\:\frac{6-x}{6}$

$\left(5x+6x\right)^{3}$

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

$2x-3\left(x-1\right)\ge6\left(x-1\right)$

$x-a\:\sqrt{x^3-a^3}$

$\lim_{x\to1}\left(\frac{x^2-1}{x^2+1}\right)$

$\int x^2\left(sin\left(x\right)+\cos\:\left(x\right)\right)dx$