$2x^3-4x^3-2x^3-5x^3$
$\frac{dy}{dx}=\frac{x+y-1}{x+y+1}$
$x^2-10x=5$
$\lim_{x\to1}\left(\frac{x^9+4x^8+7x^6-12}{x-1}\right)$
$9x^2-30x+425$
$\left(w+12\right)\left(w-12\right)$
$4x^2+23x+33=2x+8$
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