11/13=9/u

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Solution for 11/13=9/u equation: 


D( u )

u = 0

u = 0

u = 0

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

11/13 = 9/u // - 9/u

11/13-(9/u) = 0

11/13-9*u^-1 = 0

-9*u^-1 = -11/13 // : -9

u^-1 = 11/117

-1 < 0

1/(u^1) = 11/117 // * u^1

1 = 11/117*u^1 // : 11/117

117/11 = u^1

u = 117/11

u = 117/11

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