$\frac{2x^2-5x-7}{x-2}$
$\frac{dn}{dt}=0.25n\left(10-n\right)$
$72+\infty$
$\left(\frac{61.80}{59.70}\right)-1\cdot100$
$\sec^2x=-2\sec x$
$11x\:;\:x=2$
$-1230\cdot\left(-615\right)$
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