$\left(-5+5-8-2\right).\left(7\right)$
$\sqrt{x^2-4}\frac{dy}{dx}=14x$
$\left(-4\right)\cdot5\cdot\left(-47\right)$
$\frac{5m^2}{7n^3}\cdot\frac{14an^4}{10m^4}$
$\frac{x+2}{3}=\frac{3x-2}{6}$
$\lim_{x\to2.001}\:\left(x^2-3x+1\right)$
$\left(x^2-4\right)\left(x-21\right)$
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