$20x^2+7x-6$
$\left(2b-11\right)\left(2b+11\right)$
$\lim_{x\to-1}\left(\frac{8x^4+9x^3+4x+5}{x+1}\right)$
$\frac{3}{x^3-4}$
$\left(10-3m^2\right)\left(10+3m^2\right)$
$\frac{13m}{3}\left(\frac{3m}{5}+\frac{5n}{3}\right)-\frac{3n}{13}\left(13+\frac{13m}{3}\right)$
$64c^6-25b^4$
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