(9-z)/(z-9)

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Solution for (9-z)/(z-9) equation: 


D( z )

z-9 = 0

z-9 = 0

z-9 = 0

z-9 = 0 // + 9

z = 9

z in (-oo:9) U (9:+oo)

(9-z)/(z-9) = 0

9-z = 0 // - 9

-z = -9 // * -1

z = 9

z in { 9} 

z belongs to the empty set

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