$\left(2b+5\right)\left(2b-6\right)$
$x^2-2x-3x^5=6x$
$\lim_{x\to1}\left(\frac{x}{1-x^2}\right)$
$\left(7cd+4c\right)+\left(5b\right)$
$\frac{x^2}{2x+1}>-1$
$\left(2x^5-5\right)^5$
$88.2\cdot\frac{1}{1000}$
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