$x^2-2x+20$
$\frac{5x}{x-4}>6$
$x2y\left(2ax-2xy-3by\right)$
$4x^24x+1$
$\frac{dy}{dx}-3y=e^xy^2$
$\sqrt{a^2+b}.\sqrt{a^2+b}+b$
$9x^4y^2+12x^2y+4x^2$
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