$x^2-6x+9+6x-6-x^2$
$\left(4m\cdot6\right)^2$
$x^2-67x+850$
$3x^3+7x^2-4x+\frac{3}{x+3}$
$x^2+5>0$
$\frac{z^{-3}}{3}$
$25x^2-81z^2$
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