$\frac{dy}{dx}\left(x^3+7xy-y^2=5\right)$
$x+4<5$
$7x^2y-7x^2uy+17xy$
$-\frac{90}{3}$
$\left(x^2y^{-3}\right)^{-4}$
$\lim_{x\to-3}\left(\frac{2x+3}{x}\right)$
$16u-5y+3u+7u$
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