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posted by jimmy on Friday, June 29, 2012 at 8:25am.

subtract: 7-z/z-5 - 4z-9/5-z

I am sure you meant: (7-z)/(z-5) - (4z-9)/(5-z) = (7-z)/(z-5) + (4z-9)/(z-5) = (7-z + 4z-9)/(z-5) = (3z-2)/(z-5)

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