90/3=9/u

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Solution for 90/3=9/u equation: 


D( u )

u = 0

u = 0

u = 0

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

90/3 = 9/u // - 9/u

90/3-(9/u) = 0

90/3-9*u^-1 = 0

-9*u^-1 = -30 // : -9

u^-1 = 10/3

-1 < 0

1/(u^1) = 10/3 // * u^1

1 = 10/3*u^1 // : 10/3

3/10 = u^1

u = 3/10

u = 3/10

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