$x^2-14x-20$
$\lim_{x\to0.99}\left(\frac{2x^2-x-1}{x-1}\right)$
$20x^7+5n$
$\int sen\frac{2}{3}x\:dx$
$\left(+1\right)+\left(+3\right)+\left(+5\right)+\left(+2\right)+\left(-6\right)$
$x^3-\frac{1}{x}^{20}$
$-5m+12\left(3+m\right)$
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