3=81/u

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Solution for 3=81/u equation: 


D( u )

u = 0

u = 0

u = 0

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

3 = 81/u // - 81/u

3-(81/u) = 0

3-81*u^-1 = 0

-81*u^-1 = -3 // : -81

u^-1 = 1/27

-1 < 0

1/(u^1) = 1/27 // * u^1

1 = 1/27*u^1 // : 1/27

27 = u^1

u = 27

u = 27

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