$17-7+7-8+2-8$

$18x+4x^2+18-3x^2$

$4w-w^2$

$\lim_{x\to\infty}\left(-2be+4\left(-\sqrt{b}e^{-\sqrt{b}}-e^{-\sqrt{b}}\right)\right)$

$\int\left(\frac{t^2-3}{-t^3+9t+1}\right)dt$

$\left(x+\frac{2}{3}\right)\left(x-\frac{1}{2}\right)$

$\left(7x^5+y^3\:\right)\left(7x^5-y^3\:\right)$