$\frac{a-1}{1-a}$
$14+4x=2-2x$
$27x^6-64y^{12}$
$\left(2.3\cdot10^{14}\right)\left(1.9\cdot10^{-10}\right)$
$\lim_{x\to-1}\left(-\frac{x^2-3x-4}{x+1}\right)$
$\lim_{x\to0}\left(ln\left(\frac{x}{x+1}\right)\right)$
$\int-\frac{1}{3}x^{\frac{-4}{3}}dx$
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