$2x+y+z;\:x=7;\:y=4;\:z=1$

$\int2\left(x+\frac{x^3}{3}\right)dx$

$4x^2y^2-1$

$\frac{dy}{dx}=-\frac{\left(y\left(2x^3-y^3\right)\right)}{x\left(2y^3-x^3\right)}$

$a^{-4}\cdot a^2$

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

$2\left(y^3+11y^2+75y+126\right)$