9=-3/u

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Solution for 9=-3/u equation: 


D( u )

u = 0

u = 0

u = 0

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

9 = -3/u // + -3/u

9-(-3/u) = 0

3*u^-1+9 = 0

3*u^-1 = -9 // : 3

u^-1 = -3

-1 < 0

1/(u^1) = -3 // * u^1

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

-1/3 = u^1

u = -1/3

u = -1/3

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