$\frac{b^4-81}{b+3}$
$4x^2-12x+9\le0$
$1524-85.78$
$\frac{d}{dx}\frac{x}{3}$
$-3\cdot\left(2\right)+5$
$\left(2k^{2}-8k\right)+\left(-3k+12\right)$
$\int xe^{2-3x^2}dx$
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