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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-6 = -8/u // + -8/u
-(-8/u)-6 = 0
8*u^-1-6 = 0
8*u^-1 = 6 // : 8
u^-1 = 3/4
-1 < 0
1/(u^1) = 3/4 // * u^1
1 = 3/4*u^1 // : 3/4
4/3 = u^1
u = 4/3
u = 4/3
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