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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u = -8 // + 8
4/u+8 = 0
4*u^-1 = -8 // : 4
u^-1 = -2
-1 < 0
1/(u^1) = -2 // * u^1
1 = -2*u^1 // : -2
-1/2 = u^1
u = -1/2
u = -1/2
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