$\lim_{x\to-3}\left(-2x^3\right)$
$x\frac{dy}{dx}=\left(x+1\right)\left(y-1\right)$
$\frac{x^3}{\left(1+x^4\right)}$
$5x^2+50x+25=0$
$2m^5+m^4-25m^3-12m^2=0$
$-120+5-5+9-40$
$\frac{2x+1}{x-5}\le\:3$
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