$3x^2+7x+4$
$4\left(8k+9\right)$
$\lim_{x\to\infty}\left(\frac{x+3}{x^2-3x+2}\right)$
$-3x-3x-3x-3x-3x-3$
$1x^2-1x-1$
$38^2-32^2$
$4006-1820$
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