$3u+9-8u=-31$
$a^2b^4-100$
$7a^3\left(1-2a+5a^2\right)$
$4x^2-24x+11$
$\lim_{x\to\frac{\pi^2}{4}}\left(xtan\sqrt{x}\right)$
$\left(2-4x+2x^3\right)-\left(x^2-4x+4x^3\right)$
$\left(x+2\right)^2=_{+4x+4}$
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