$\left(w+3\right)\left(w-3\right)$
$\lim_{x\to-1}\left(\frac{x^2+1}{x}\right)$
$30+5+8-3+1-4$
$f\left(x\right)=7x^2+12x+5$
$( 2 b + 2 ) - 3 ( 7 b - 4 )$
$\frac{dy}{dx}=-y+e^{-x}$
$-270\cdot8$
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