10/2=40/z

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Solution for 10/2=40/z equation: 


D( z )

z = 0

z = 0

z = 0

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

10/2 = 40/z // - 40/z

10/2-(40/z) = 0

10/2-40*z^-1 = 0

-40*z^-1 = -5 // : -40

z^-1 = 1/8

-1 < 0

1/(z^1) = 1/8 // * z^1

1 = 1/8*z^1 // : 1/8

8 = z^1

z = 8

z = 8

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