$3x^4+33x^3+126x^2+216x+135$
$\frac{d}{dx}x^3y+xy^3-2=0$
$7x-49=0$
$1+-100$
$7x-3\le-5x+33$
$2\sqrt{8m^2n^3}$
$\left(b^2-7c\right)\left(a^2+2b-2ac+3abc\right)$
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