$9x^2-30x^2y+25^2y^2$
$\lim_{x\to0}\left(\frac{3x}{3x+1\:}\right)^x$
$2x^2-4x-3$
$x\frac{dy}{dx}+4y-x^3+x=0$
$18^5$
$\frac{dy}{dx}+2y=xy^4$
$x+\sqrt{x+1}-5=0$
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