$-4x-12>8$
$\frac{25-36x^2}{5-6x^2}$
$\left(10x+4y\right)^2$
$\left(\left(3^{-1}\right)^{-1}\right)^{-1}$
$48-2^2.\:2$
$\frac{d}{dx}\left(x-y^2\right)xy\:=\:0$
$x\left(7+6x\right)x\left(7+6x\right)\:$
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