$-54x^5+2x^3+36x^2$
$\frac{2x^2-5x+2}{2x-1}$
$5c=40$
$4x-7<3x-5$
$x^4-m^8x^9$
$\frac{1}{x+3}\le2$
$\frac{d}{dx}x^2+y^2-4=0$
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