12/z-3=15/z+1

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Solution for 12/z-3=15/z+1 equation: 


D( z )

z = 0

z = 0

z = 0

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

12/z-3 = 15/z+1 // - 15/z+1

12/z-(15/z)-3-1 = 0

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

-3*z^-1 = 4 // : -3

z^-1 = -4/3

-1 < 0

1/(z^1) = -4/3 // * z^1

1 = -4/3*z^1 // : -4/3

-3/4 = z^1

z = -3/4

z = -3/4

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