$\lim_{x\to2}\left(\frac{2x-4}{x-2}\right)$
$72x^2-12x+24$
$\lim_{x\to0}\left(\frac{3x^2+2x-1}{4x^2}\right)$
$y'+2xy=4x$
$\lim_{x\to-\infty}\left(\frac{3^x-1}{3^x+1}\right)$
$-1-\left[5-\left(-2\right)\right]$
$\left(2x+5x\right)\left(7+5x\right)$
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