12/15=-8/z

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Solution for 12/15=-8/z equation: 


D( z )

z = 0

z = 0

z = 0

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

12/15 = -8/z // + -8/z

12/15-(-8/z) = 0

8*z^-1+12/15 = 0

8*z^-1 = -4/5 // : 8

z^-1 = -1/10

-1 < 0

1/(z^1) = -1/10 // * z^1

1 = -1/10*z^1 // : -1/10

-10 = z^1

z = -10

z = -10

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