$9ax+81b$
$2\:\ln\sqrt{x}$
$-5x.\left(2x-5x^2+4\right)$
$49x^4y^6z^8-1$
$\frac{dy}{dx}\left(\frac{x^2}{x+y}\right)=\frac{dy}{dx}\left(y^2+9\right)$
$3x+2y=-6$
$\frac{1}{x}+3<-4$
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