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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
11/13 = 9/u // - 9/u
11/13-(9/u) = 0
11/13-9*u^-1 = 0
-9*u^-1 = -11/13 // : -9
u^-1 = 11/117
-1 < 0
1/(u^1) = 11/117 // * u^1
1 = 11/117*u^1 // : 11/117
117/11 = u^1
u = 117/11
u = 117/11
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