$\lim_{x\to5}\frac{x^3-9x}{x^2-3x}$
$x^2+20x+0$
$1+10x+1-6$
$\frac{6x^5+4x^3-3}{2x^2+4x+5}$
$-3-\left|-10\right|$
$\frac{dy}{dx}\left(x^5+2x\right)^7$
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