$-8n+n$
$15xy^3-35x^2y+20x^3y^2$
$\lim_{x\to1}\left(\frac{\sqrt{25-x^2}-5}{x}\right)$
$x^2-10x+10=-11$
$\int\frac{1}{\sqrt{x^2-14x-48}}dx$
$5<4x+6$
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