Asked by jimmy

subtract:
7-z/z-5 - 4z-9/5-z
Answered by Reiny
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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