7/3=9/u

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Solution for 7/3=9/u equation: 


D( u )

u = 0

u = 0

u = 0

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

7/3 = 9/u // - 9/u

7/3-(9/u) = 0

7/3-9*u^-1 = 0

-9*u^-1 = -7/3 // : -9

u^-1 = 7/27

-1 < 0

1/(u^1) = 7/27 // * u^1

1 = 7/27*u^1 // : 7/27

27/7 = u^1

u = 27/7

u = 27/7

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