7/20=5/z

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Solution for 7/20=5/z equation: 


D( z )

z = 0

z = 0

z = 0

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

7/20 = 5/z // - 5/z

7/20-(5/z) = 0

7/20-5*z^-1 = 0

-5*z^-1 = -7/20 // : -5

z^-1 = 7/100

-1 < 0

1/(z^1) = 7/100 // * z^1

1 = 7/100*z^1 // : 7/100

100/7 = z^1

z = 100/7

z = 100/7

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