$-4\left(1\right)\left(-14\right)$
$\frac{x-2x}{x}$
$6\left(x^{2}-4x+1\right)$
$\lim_{x\to-2}\left(\frac{4-x^2}{3x-\sqrt{x^2+5}}\right)$
$\frac{\left(2a^{-1}b^2\right)^2}{\left(a^{-3}b\right)^3}$
$-\frac{99}{99}$
$x^2-2x+37$
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