$\int\left(3x-1\right)^4\cdot2xdx$

$\lim_{t\to5}\left(\frac{\left(1-t\right)\left(t+5\right)}{3t-7}\right)$

$\int\frac{x+x^2+x^3}{x^2}dx$

$4s\:+\:8\:-\:3s\:-\:11\:+\:8s\:-\:2$

$-\frac{3}{8}x^2-\frac{5}{8}x^2-x^2$

$\lim_{x\to2}\left(x^3-2x^2+7x+1\right)$

$\frac{y-8}{3}=\frac{-3}{y}$