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posted by nicki Wednesday, January 6, 2010 at 9:13pm.

p^5 p^-4 z^2 divided by z^-5 zp^3 -21a^2 b^8 divided by -18a^-4 b^10 (2kr^3)^-3 divided by 4k^-2 r^6

y^2+3y+9/4

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