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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-8/u = -6 // + 6
6-8/u = 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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