$15n^3-15n^2+20n$
$4x^2+x+5=0$
$2\left(x-5\right)\left(x-6\right)+3\left(x+5\right)\left(x-5\right)-3\left(x-5\right)^2$
$\lim_{x\to-3}\left(-2x-3\right)$
$6m+5-m-5m+12-17$
$4\frac{dy}{dx}=e^{-2x-3y}$
$\int_0^4e^xdx$
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