$\left(\frac{1}{2}x^3-\frac{1}{4}x^2-5x+9\right)-\left(\frac{1}{5}x^3-\frac{8}{3}x^2\frac{5}{4}x\frac{1}{2}\right)$

$\int\:\frac{7x+1}{\left(x+3\right)\left(x+1\right)}dx$

$2^3\sqrt{16x^2} y^7$

$\frac{x}{258}<5$

$-6n+n+3u$

$\frac{2x^3-1x^2-12x-9}{x+1}$

$\int\left(\frac{x+2}{\sqrt{x}}\right)dx$