$-x^2+8x+9$
$4a^2\:b^2-9x^6\:y^8\:$
$\left(x-2\right)\left(x^2+8x-1\right)$
$-3x\left(x+9\right)>0$
$x^3\sqrt{1}+x^2$
$a^3+2a-a^2$
$\frac{3x}{4}+2;\:x=8$
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