$\left(x^2-1\right)\left(x^4+x^2+1\right)$
$-x^2+4x+8$
$\left|\left(-4\right)\cdot7\right|$
$13mn+8b+9mn-3b$
$\frac{x^{-1}}{4x^4}$
$\lim_{t\to0}\left(\frac{1}{t}+\frac{1}{t^2+t}\right)$
$10-20i$
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