$20\cdot5$
$\lim_{x\to0}\left(\frac{hx}{e^x-1}\right)$
$\left(-y^2-4y+1\right)-\left(-y-3\right)$
$\frac{d}{dx}\left(25x-0.2x^2-8\right)$
$5x^2-4x+2$
$20x^3-65x^2+45x$
$\frac{3}{x+1}-\frac{2x}{x-1}+\frac{1}{x^2-1}=-2$
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