$18n+6$
$\int20x^4dx$
$\left(u-19\right)^2$
$3x^2y-2xy$
$\left(r^x+7\right)\left(r^x-10\right)$
$\left(-12^2-7x\right)$
$\lim_{x\to\infty}\left(\frac{6x^3-5x^2+3x}{2x^3-11x}\right)$
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