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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
12/u = 1 // - 1
12/u-1 = 0
12*u^-1 = 1 // : 12
u^-1 = 1/12
-1 < 0
1/(u^1) = 1/12 // * u^1
1 = 1/12*u^1 // : 1/12
12 = u^1
u = 12
u = 12
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