3/7=13/u

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Solution for 3/7=13/u equation: 


D( u )

u = 0

u = 0

u = 0

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

3/7 = 13/u // - 13/u

3/7-(13/u) = 0

3/7-13*u^-1 = 0

-13*u^-1 = -3/7 // : -13

u^-1 = 3/91

-1 < 0

1/(u^1) = 3/91 // * u^1

1 = 3/91*u^1 // : 3/91

91/3 = u^1

u = 91/3

u = 91/3

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