$\frac{d}{dx}y^{-3}x^6+y^6x^{-3}=2x+1$
$\lim_{x\to4}\left(\left(\frac{\left|4-x\right|}{x^2-11a+28}\right)\right)$
$x^4+18x-19$
$445\:-127$
$-\:3x\:-\:30$
$8x^2-36x^2+36x-27$
$\left(x+4\right)x\left(x-4\right)$
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