$y=x\frac{dy}{dx}$
$-8\frac{1}{2}^3$
$\frac{3n^{-4}}{n^3}$
$9\left(2+1\right)-12+4$
$9a^3x^4-27a^2x^4-36a^4x^2$
$2u^2+u-1$
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