$2x^2.\left(2x+3\right)^2-x.\left(x+1\right)\left(x-1\right)-5.\left(3x^2-x\right)^2$

$\int\left(\frac{9x+6}{x^3-x^2-2x}\right)dx$

$\left(x-2\right)\frac{dy}{dx}+xy=0$

$\left(-3\right)^3\cdot5^2$

$x\cdot\frac{dy}{dx}+2y=3x-6$

$\int\:\frac{1}{\left(x-3\right)\cdot\:\left(x+1\right)\cdot\:\left(x+3\right)}$

$\left(-30\right)+20\cdot\left(-4\right)$