$\lim_{x\to6}\left(\frac{2}{x-6}\right)$
$3xy^3-2y+xy^2-xy=0$
$\left(-4b+5\right)^2$
$u^2-5u+2$
$\left(-4a+b\right)\left(a+b\right)$
$\frac{9+9}{9\left(1-\left(1+6\right)\right)+2+9b}$
$m^4+50m^2+100$
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