$x^3+3x^2-x$
$5x-3y-x-8y$
$\frac{3x^2+7x+5}{3x+1}$
$\lim_{x\to+\infty}\left(\sqrt{x^2+2x+5}-x\right)$
$x^3-5x^2+4x$
$y^2+8x+8=0$
$-5a^3b^3\left(2a^3bc+3b^2c-4c^4\right)$
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