$x+6>4-3x$
$81-72m+16m^2$
$2x^2-25x+50$
$x^2+12x+19=0$
$\lim_{x\to0}\left(\left(2-\frac{x}{x^2-1}\right)\left(\frac{3x^2}{4x^2-2x}\right)\right)$
$\frac{d}{dx}x^2+y^2=xy$
$-25-6x$
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