$+3200-50-85+500$

$\left(5x^2\:y^3\:z\right)^2$

$\int\frac{1}{\left(x^2+4x+20\right)}dx$

$5x-4=51$

$\frac{y^4}{121}+\frac{1}{2}+\frac{121}{16y^4}$

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

$\left(\frac{1}{2}m-\frac{2}{3}n-\frac{1}{4}\right)\left(\frac{1}{2}+\frac{2}{3}n-\frac{1}{4}\right)$