$\:|-5\:-\:\left(-4\right)\:-\:\left(-9\right)|$

$\lim_{x\to0}\left(4+x^{3lnx}\right)$

$\frac{12x+10y}{2}=30$

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

$-2\left(2\right)\left(729\right)+16\left(8\right)\left(729\right)$

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

$\int\frac{\left(2x+5\right)}{x^2-4x+13}dx$