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D( u )
u-1 = 0
u-1 = 0
u-1 = 0
u-1 = 0 // + 1
u = 1
u in (-oo:1) U (1:+oo)
-6 = -(3/(u-1)) // + 3/(u-1)
3/(u-1)-6 = 0
3/(u-1)+(-6*(u-1))/(u-1) = 0
3-6*(u-1) = 0
9-6*u = 0
(9-6*u)/(u-1) = 0
(9-6*u)/(u-1) = 0 // * u-1
9-6*u = 0
9-6*u = 0 // - 9
-6*u = -9 // : -6
u = -9/(-6)
u = 3/2
u = 3/2
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