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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
5/11 = 12/u // - 12/u
5/11-(12/u) = 0
5/11-12*u^-1 = 0
-12*u^-1 = -5/11 // : -12
u^-1 = 5/132
-1 < 0
1/(u^1) = 5/132 // * u^1
1 = 5/132*u^1 // : 5/132
132/5 = u^1
u = 132/5
u = 132/5
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