$-21\cdot2$
$10w^2-29w-3$
$\lim_{x\to-1}\left(x^3+2x^2-4x+1\right)$
$\left(x^2-2x+5\right)+\left(-5x^2-7x+6\right)$
$\frac{dy}{dx}+9xy=4x$
$9a^212ab+4b^2$
$2m^2-50$
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