Posted by simone on Sunday, August 8, 2010 at 6:48pm.
(YZ^-2)^4(2Y^-3Z^-4)^3 / (4Y^9Z^-5 =
(Y^4Z^-8)(8Y^-9Z^-12) / (4Y^9Z^-5)=
8Y^-5Z^-20 / 4Y^9Z^-5 =
2Y^-14Z^-15 = 2 / Y^14Z^15
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