$\lim_{x\to1}\left(\left\{x+1\right\}\left\{x-1\right\}\right)$
$-3y^2+4=2x^2$
$4x^2+7x^2$
$x+7\ge2$
$15m^3n^2+20m^2n^3-25m^4n^5$
$2x-3<x+4$
$\frac{8}{\frac{5}{5}}$
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