3z^3/5*40/z^2

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Solution for 3z^3/5*40/z^2 equation: 


D( z )

z^2 = 0

z^2 = 0

z^2 = 0

1*z^2 = 0 // : 1

z^2 = 0

z = 0

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

(40*((3*z^3)/5))/(z^2) = 0

24*z = 0 // : 24

z = 0

z in { 0} 

z belongs to the empty set

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