$3x^3+6x+3$
$\frac{3-x\left(x+2\right)}{54}$
$t-\frac{1}{t+1}$
$5x-5<20$
$\left(3x^2-8x+4\right)\:e^{-2x}$
$6x^2y-9x^3y$
$\lim_{x\to0}\left(\frac{x^2}{x-4}\right)$
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