$3x^2+x-7-x^2-2x+5$

$\int x^3\sqrt{2+x^4}dx$

$-\frac{4}{7}n+\left(-\frac{2}{7}n\right)+\frac{1}{7}$

$\left(z^7-3\right)\cdot\left(z^7+3\right)$

$\left(5y^2+7\right)+\left(2y^2-2\right)$

$\lim_{x\to\infty}\left(-\frac{2}{3}x^7+\frac{5}{3}x^6-\frac{1}{7}x^5+\frac{8}{7}\right)$

$\int_x^{\infty}\left(\frac{e^{-\frac{x}{22}}}{22}\right)dx$