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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
11/17 = 12/u // - 12/u
11/17-(12/u) = 0
11/17-12*u^-1 = 0
-12*u^-1 = -11/17 // : -12
u^-1 = 11/204
-1 < 0
1/(u^1) = 11/204 // * u^1
1 = 11/204*u^1 // : 11/204
204/11 = u^1
u = 204/11
u = 204/11
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