$\lim_{x\to4}\frac{x^2-6x+22}{x+3}$
$\lim_{x\to1}\left(x^{7x-7}\right)$
$0.0278-0.00143$
$-7+\left|-2\cdot\left(3-4\cdot2\right)-1\right|$
$9\left(4y^2-12y+9\right)$
$6+4x-x^2$
$\:\:n\:2\:+\:n\:-\:20\:=\:$
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