$2x^2\:+72\:\:\:+\:\:\:\:2x^2\:+\:2$

$-3y-\frac{1}{2}x+3y+\frac{1}{2}x+4y-\frac{1}{2}x-4y+4z+8z-\frac{1}{4}x$

$14r\:+\:14\:-\:r\:-\:6$

$\int_0^5-e^{-x}dx$

$2xy+xy-x$

$\frac{\left(7s-10\right)}{\left(\left(s-1\right)\left(s-2\right)\right)}+5s-2$

$\lim_{x\to\infty}\left(\frac{7x^2-5x+12}{5+3x^5}\right)$