2/7=12/z

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Solution for 2/7=12/z equation: 


D( z )

z = 0

z = 0

z = 0

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

2/7 = 12/z // - 12/z

2/7-(12/z) = 0

2/7-12*z^-1 = 0

-12*z^-1 = -2/7 // : -12

z^-1 = 1/42

-1 < 0

1/(z^1) = 1/42 // * z^1

1 = 1/42*z^1 // : 1/42

42 = z^1

z = 42

z = 42

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