$\lim_{x\to0}\left(\frac{2n}{\sqrt{n^2+1}}\right)$
$-5xy+y$
$\frac{64a^6-b^9}{4a-b^3}$
$64a^3-m^3$
$2x^2+3x-5+0$
$3t^2+24t=y$
$4x-6y$
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