$\frac{dy}{dx}\left(x^2-xy+y^2=5\right)$
$-12-y\:y=19$
$8x^2+20x^2y^2+50y^2$
$\frac{dy}{dx}=e^{\left(6y+7x\right)}$
$225x^4+25m^2-150x^2mn^2$
$\left(\frac{3}{5}a+\frac{2}{3}\right)\left(\frac{3}{5}a-\frac{2}{3}\right)$
$\frac{9x^3}{4}.\frac{9}{2x^4}$
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