3=(1)/(u-1)

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Solution for 3=(1)/(u-1) equation: 


D( u )

u-1 = 0

u-1 = 0

u-1 = 0

u-1 = 0 // + 1

u = 1

u in (-oo:1) U (1:+oo)

3 = 1/(u-1) // - 1/(u-1)

3-(1/(u-1)) = 0

3-(u-1)^-1 = 0

3-1/(u-1) = 0

(3*(u-1))/(u-1)-1/(u-1) = 0

3*(u-1)-1 = 0

3*u-4 = 0

(3*u-4)/(u-1) = 0

(3*u-4)/(u-1) = 0 // * u-1

3*u-4 = 0

3*u-4 = 0 // + 4

3*u = 4 // : 3

u = 4/3

u = 4/3

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