$3x^2+12x+5=0$
$5.9-5.67$
$x^3y^{-1}\cdot x^{-4}y^2$
$-2\cot\left(\frac{\pi}{6}\right)+\frac{\pi}{6}-3\tan\left(\frac{\pi}{6}\right)$
$3-4-4-4-6+21+7+8$
$y=7x^{-x}$
$\frac{7xy}{7}$
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