$\frac{x^2-4x-45}{x^2-81}$
$\left(x-y^22\right)^6$
$+7+4+3$
$4x^2+9x+36$
$9x+13y-9z\left(7x-\left(-y+2z-\left(5x-9y+5z\right)-3z\right)\right)$
$\left(-2x-3\right)\left(2x+3\right)\ge0$
$3y^2-12y=0$
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