13/7=8/u

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Solution for 13/7=8/u equation: 


D( u )

u = 0

u = 0

u = 0

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

13/7 = 8/u // - 8/u

13/7-(8/u) = 0

13/7-8*u^-1 = 0

-8*u^-1 = -13/7 // : -8

u^-1 = 13/56

-1 < 0

1/(u^1) = 13/56 // * u^1

1 = 13/56*u^1 // : 13/56

56/13 = u^1

u = 56/13

u = 56/13

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