$\left(6x-3\right)\left(-6x-3\right)$
$\int\frac{3x}{x^2-4}dx$
$\lim_{x\to2}\left(\frac{x^2+5x+6}{x+2}\right)$
$-222+-49$
$-3-2-8-7-20-15-9$
$\int e^{-3x^4}dx$
$-6n+n+3n$
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