$f^2-7f-30$
$-x^2+40x-400$
$\frac{dx}{dy}=x^2-2x+2$
$-4+6+-14+7+-42+4$
$\lim_{x\to-1}\left(30x\right)$
$\frac{x^2-6x+9}{x^2-x-6}$
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