$19\left(-50\right)\left(56\right)$
$\frac{x^3-9x+20}{x^3-25}$
$x^2+12x=-8$
$\left(3a-2b^2\right)^3$
$\lim_{x\to1}\left(\frac{u\left(1-u^{x-1}\right)}{x-1}\right)$
$4n^2+8n+4$
$\int\left(x-1\right)^4dx$
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