$\left(x^3-3x+2\right)+\left(-2x^2+7x\right)+\left(-x^3-2\right)$

$\frac{dx}{dt}=-x^2+4$

$4xy-2x^2y=2\left(x-xy\right)$

$x+\frac{2}{5}\sqrt{x^{5}}+c_{0}$

$x^2-23x+120=0$

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

$\int\left(x^2+4\right)^{\frac{3}{2}}dx$