$\frac{b^2-9b-x}{b^2}$
$\left(100-5t\right)\frac{dx}{dt}=2,5-20x$
$-y^2-3y-2$
$\left(z^2-3z+3\right)-2\left(z-1\right)$
$\lim_{x\to0}\left(x^{8sin\left(x\right)}\right)$
$2x^2+3x-5+0$
$\int\frac{x^2}{\left(x^2\:-\:2x\:+\:2\right)}\:dx$
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