8/7=9/u

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Solution for 8/7=9/u equation: 


D( u )

u = 0

u = 0

u = 0

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

8/7 = 9/u // - 9/u

8/7-(9/u) = 0

8/7-9*u^-1 = 0

-9*u^-1 = -8/7 // : -9

u^-1 = 8/63

-1 < 0

1/(u^1) = 8/63 // * u^1

1 = 8/63*u^1 // : 8/63

63/8 = u^1

u = 63/8

u = 63/8

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