9=-6/u

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Solution for 9=-6/u equation:


D( u )

u = 0

u = 0

u = 0

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

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

9-(-6/u) = 0

6*u^-1+9 = 0

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

u^-1 = -3/2

-1 < 0

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

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

-2/3 = u^1

u = -2/3

u = -2/3

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