$-4k\left(-5-k\right)$
$a^2+4a+25$
$x^2-0,32x+0,026=280$
$2y^5-18y^3$
$\left(1+\sqrt{y-x+5}\right)dx\:-\:dy\:=0$
$\lim_{w\to0}\left(\frac{w+w^2}{w-w^2}\right)$
$\left(2a-5\right)\left(2a+11\right)$
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