-4=-(7/u-1)

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Solution for -4=-(7/u-1) equation: 


D( u )

u = 0

u = 0

u = 0

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

-4 = -(7/u-1) // + 7/u-1

7/u-4-1 = 0

7*u^-1 = 5 // : 7

u^-1 = 5/7

-1 < 0

1/(u^1) = 5/7 // * u^1

1 = 5/7*u^1 // : 5/7

7/5 = u^1

u = 7/5

u = 7/5

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