$\frac{u}{7}-1.5=-23.9$
$1-3+40-23+2$
$\int\frac{n}{n^3-n^2-n+1}dn$
$\frac{d}{dx}x^3y+xy^3-2=0$
$\left(x+14\right)\left(x+45\right)$
$-6x^3+7x^3+3x+7x$
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