$325-721+321-520$

$3\left(2x\:-\:1\right)\:=\:33$

$\lim_{x\to0}\left(\frac{e^{2x}-2x-1}{x^2-3x}\right)$

$\frac{d}{dx}\frac{3x-7}{x+2}$

$n^{-1}\left(\frac{1-x}{1+x}\right)$

$-\left(19\right)\cdot\left(-150\right)\cdot\left(380\right)$

$\int\left(\frac{\sin\left(x\right)}{e^{2x}}\right)dx$