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