$\frac{21^x}{3^x}$
$\left(-13x-11\right):\left(-3\right)<\left(-6x-2\right):\left(-2\right)+3x$
$\lim_{x\to0}\left(\frac{xsin\left(0\right)}{x^2}\right)$
$x^5-6x^3+6x^2-7x+6$
$\lim_{x\to2}\left(\frac{x+1}{x-2}\right)$
$\lim_{x\to0}\frac{2x^2-5x}{x}$
$\frac{-t^3+3t^2-9t}{-t}$
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