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D( u )
u-2 = 0
u-2 = 0
u-2 = 0
u-2 = 0 // + 2
u = 2
u in (-oo:2) U (2:+oo)
6/(u-2) = 5 // - 5
6/(u-2)-5 = 0
6/(u-2)+(-5*(u-2))/(u-2) = 0
6-5*(u-2) = 0
16-5*u = 0
(16-5*u)/(u-2) = 0
(16-5*u)/(u-2) = 0 // * u-2
16-5*u = 0
16-5*u = 0 // - 16
-5*u = -16 // : -5
u = -16/(-5)
u = 16/5
u = 16/5
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