$\frac{z}{4}+7>-5$
$y'=2\cdot y\cdot\left(3-y\right)$
$2\frac{dy}{dx}-3y=\:e^{-x}$
$\frac{x^5-x^4+2x^2-2}{x^2+1}$
$5x^2+x=0$
$12u^2+4u^2$
$\frac{4x^3-2x^2+x-1}{x^2+x+1}$
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