$\frac{dy}{dx}=\frac{y+5}{9x+238}$
$25m^2-10mn+n^2$
$4x^2-2y^2$
$2x+2>-3x+1$
$x+15-\frac{x-6}{15}\ge2x-3+\frac{x-4}{9}$
$x-4^2^2$
$x^2\:+\:2x\:+1\:\ge\:0$
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