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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u = 5/11 // - 5/11
4/u-(5/11) = 0
4/u-5/11 = 0
4*u^-1 = 5/11 // : 4
u^-1 = 5/44
-1 < 0
1/(u^1) = 5/44 // * u^1
1 = 5/44*u^1 // : 5/44
44/5 = u^1
u = 44/5
u = 44/5
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