$\:-8x+6+8x-3$
$x^2-10x+21\le0$
$\tan^2x=3\tan x$
$3x^2-8x=0$
$\left(4d+2b\right)\left(-mn\right)$
$\frac{d}{dx}e^{-4x}+2e^{3x}$
$\left(m^2+m^2n^2+n^4\right)\left(m^{2\:}-n^2\right)$
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