$x^2+4^2+8x-x^2+1^2-2x$
$\frac{81x^4y^2}{2}+36x^2y+8$
$\lim_{x\to-1}\left(\frac{x^2-5x+4}{x^3-1}\right)$
$\frac{dy}{dx}=x^5\left(y-2\right)$
$\frac{z^2-18z}{z}$
$vt-25t^2$
$x^2-14x+58=0$
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