2/5=12/z

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Solution for 2/5=12/z equation: 


D( z )

z = 0

z = 0

z = 0

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

2/5 = 12/z // - 12/z

2/5-(12/z) = 0

2/5-12*z^-1 = 0

-12*z^-1 = -2/5 // : -12

z^-1 = 1/30

-1 < 0

1/(z^1) = 1/30 // * z^1

1 = 1/30*z^1 // : 1/30

30 = z^1

z = 30

z = 30

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