$x+6-x<2x$
$a^2+9ar$
$63\le-4x-17$
$m^2-2m-8$
$\left(3a^2b^3-4ab\right)^2$
$\frac{d}{dx}y^{-3}x^6+y^6x^{-3}=2x+1$
$\left(9-y\right)^2$
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