$\frac{x-1}{-3}+\frac{1}{5}\le\frac{x}{2}-3$

$64x^2-160y+100y^2$

$5\ln\left(x\right)+2\ln\left(y+1\right)-\left(3\ln\left(x\right)+2\ln\left(z+3\right)\right)$

$\frac{dy}{dx}+2xy=20x$

$16m^3-28m^5$

$\left(-6\right)\cdot\left(125\right)$

$50\::\:\left(-5\right)+\left(-4\right)$