6=-9/u

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Solution for 6=-9/u equation: 


D( u )

u = 0

u = 0

u = 0

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

6 = -9/u // + -9/u

6-(-9/u) = 0

9*u^-1+6 = 0

9*u^-1 = -6 // : 9

u^-1 = -2/3

-1 < 0

1/(u^1) = -2/3 // * u^1

1 = -2/3*u^1 // : -2/3

-3/2 = u^1

u = -3/2

u = -3/2

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