(6z-30)/(8z-40)

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Solution for (6z-30)/(8z-40) equation: 


D( z )

8*z-40 = 0

8*z-40 = 0

8*z-40 = 0

8*z-40 = 0 // + 40

8*z = 40 // : 8

z = 40/8

z = 5

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

(6*z-30)/(8*z-40) = 0

6*z-30 = 0 // + 30

6*z = 30 // : 6

z = 30/6

z = 5

z in { 5} 

z belongs to the empty set

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