$\frac{x^2+1}{3-x}$
$\lim_{x\to\infty}\left(\frac{x^4-3x+1}{-5x^2+1}\right)$
$-946+-92$
$y=x-y$
$\frac{2}{x+2}+\frac{5}{x-2}=\frac{6}{x^2-4}$
$\int y^{-1}dy$
$\:-x^3+4x^2-5x+2$
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