(90/z)-(90)/(z-5)

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Solution for (90/z)-(90)/(z-5) equation: 


D( z )

z-5 = 0

z = 0

z-5 = 0

z-5 = 0

z-5 = 0 // + 5

z = 5

z = 0

z = 0

z in (-oo:0) U (0:5) U (5:+oo)

90/z-(90/(z-5)) = 0

90/z-90*(z-5)^-1 = 0

90/z-90/(z-5) = 0

(-90*z)/(z*(z-5))+(90*(z-5))/(z*(z-5)) = 0

90*(z-5)-90*z = 0

-450 = 0

-450/(z*(z-5)) = 0

-450/(z*(z-5)) = 0 // * z*(z-5)

-450 = 0

z belongs to the empty set

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