$\frac{u^2-3u}{7}=0$
$4+\frac{-20}{4}$
$-3x^4.\:2x^{-3}$
$\int\left(9x-2\right)^{-3}dx$
$28-\left(-3\right)$
$\frac{d}{dx}\sqrt{\frac{x-5}{x^8+4}}$
$\frac{tan^2\left(x\right)+2\tan\left(x\right)+1}{\tan^2\left(x\right)-1}$
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