5/15=3/z

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Solution for 5/15=3/z equation: 


D( z )

z = 0

z = 0

z = 0

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

5/15 = 3/z // - 3/z

5/15-(3/z) = 0

5/15-3*z^-1 = 0

-3*z^-1 = -1/3 // : -3

z^-1 = 1/9

-1 < 0

1/(z^1) = 1/9 // * z^1

1 = 1/9*z^1 // : 1/9

9 = z^1

z = 9

z = 9

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