$-1+9+\left(-1\right)+7+\left(-3\right)$
$3r^4\left(-12r^3\right)$
$-8m^5+4n^2-20n+8$
$\lim_{x\to0}\left(\frac{4x-3x^2+8x^3}{2x-5x^2}\right)$
$\int x^2\sqrt{9x^4+4x^2}dx$
$9x^2+30x-25$
$10x^3y^2-4x^3y^2-2x^3y^2$
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