$y=7x^{-x}$
$y^2-\:4y\:+3=\left(y-3\right)\left(y-1\right)$
$2y^2=-3x$
$\lim_{z\to0}\left(\frac{sin\left(z\right)}{z-0}\right)$
$\lim_{x\to0}\left(-\frac{1^x}{x^2-x}\right)$
$\frac{\left(4x-2\right)}{3x^2+7}$
$0^{-6}\cdot0^6$
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