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