$-11x+9>2x-30$
$\left(x+4\right)\left(x-4\right)+\left(x-9\right)\left(x+9\right)$
$x^3-4x^2-5x-9\:para\:x\:=-3$
$\left(6-9\right)-\left(-7+7\right)$
$\frac{dy}{dx}=x-2y+12$
$\left(ab^2-cd^3\right)\left(ab^2+cd^3\right)$
$\lim_{x\to3}\left(\frac{x^2+4x+1}{x-4}\right)$
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