$7+2\left(x-5\right)-6x$
$\left(4+x\right)y=y^3$
$x=20y$
$\:\frac{dy}{dx}=\frac{y}{x}+4x+7$
$\lim_{x\to0}\left(\frac{x^{-2}}{sin\left(x\right)}\right)$
$\left(m^2-2n^2\right)^2$
$\frac{4x^4+x^3-x+1}{2x^2+1}$
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