$3x^2-9x-6$
$\left(\frac{1}{9}.\frac{4}{8}.\frac{18}{5}\right)^{-2}$
$2^9\cdot2$
$w^2\:-4w-12\:=\:0$
$mx^2nx^2+mn$
$\left(5ab^2+7xy^3\right)^2$
$\frac{x^3+6x^3-12x-9}{x+3}$
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