$\frac{dy}{dx}=\frac{y+1}{x\left(y-1\right)}$
$\left(3x^2+x-1\right)-\left(4-x-x^2\right)$
$\frac{5x^4+30x^3-40x^2+36x+14}{x+7}$
$4m+44+2m$
$32p^2-50$
$x^2-10x-40$
$6x^3+3x^2-2x-1;\:x=-3$
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