$gb-fb$
$a^4b^6c^3-a^3b^5c^6-abc$
$\left(3x^3-2x^2+2x-7\right)+\left(4x^5+1\right)$
$54^2-46^2$
$4x^2-12x+2$
$\lim_{x\to0}\left(\frac{\ln\left(2x+1\right)\sin\left(2x\right)}{x^2}\right)$
$2x^2+\left(x+3\right)\left(x-1\right)\:$
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