6-18=-9/z

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Solution for 6-18=-9/z equation: 


D( z )

z = 0

z = 0

z = 0

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

6-18 = -9/z // + -9/z

6-(-9/z)-18 = 0

9*z^-1-18+6 = 0

9*z^-1 = 12 // : 9

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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