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D( u )
u-4 = 0
u-4 = 0
u-4 = 0
u-4 = 0 // + 4
u = 4
u in (-oo:4) U (4:+oo)
5 = -(8/(u-4)) // + 8/(u-4)
8/(u-4)+5 = 0
8/(u-4)+(5*(u-4))/(u-4) = 0
5*(u-4)+8 = 0
5*u-12 = 0
(5*u-12)/(u-4) = 0
(5*u-12)/(u-4) = 0 // * u-4
5*u-12 = 0
5*u-12 = 0 // + 12
5*u = 12 // : 5
u = 12/5
u = 12/5
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