4=7/u-4

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Solution for 4=7/u-4 equation: 


D( u )

u = 0

u = 0

u = 0

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

4 = 7/u-4 // - 7/u-4

4-(7/u)+4 = 0

4-7*u^-1+4 = 0

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

u^-1 = 8/7

-1 < 0

1/(u^1) = 8/7 // * u^1

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

7/8 = u^1

u = 7/8

u = 7/8

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