$7z=-21$
$\frac{dx}{dy}=x^2-2x+2$
$\frac{dy}{dx}=y^2-36$
$3-\left(-12\right)$
$4+7b^2+2+2b^2+3b$
$\lim_{x\to1}\left(\frac{x^3+3x+7}{x^2-2x+1}\right)$
$\:\frac{dy}{dx}=\frac{x\left(1+y^2\right)}{1+x^2}$
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