$2\left(x^2+5\right)$
$-7x^4+3x^3-x+5-6x^4-10x^3+x^2+11x-6$
$xdy+ydx+xy\left(3dx+dy\right)$
$8c^9+64d^3$
$\left(6u-9\right)\left(6u-9\right)$
$\lim_{x\to0}\left(1-2x-x^3\right)$
$-4\left(2x^3+7x^2-5x-4\right)$
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