$x^3-27x$
$s^2+4s+21$
$\left(4n^4-8n+4\right)-\left(8n^2+4n^4+1\right)$
$\int\frac{x^3}{4+x^2}dx$
$8x^3-5x^2$
$\left|-50\right|$
$\frac{d}{dx}x^2+x$
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