$\int\left(2x-40\right)\ln\left(x-20\right)dx$
$2x+3-2x+1$
$-y^2=y-2$
$\lim_{x\to0}\left(\frac{e^{\frac{xt}{n^{\frac{1}{2}}}}-\cos\left(x\right)}{x^2}\right)$
$\frac{2x}{x-3}-\frac{2x}{x+3}$
$\frac{5x-1}{3}\le3$
$\left|-9\right|-8$
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