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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
10/u = 11/13 // - 11/13
10/u-(11/13) = 0
10/u-11/13 = 0
10*u^-1 = 11/13 // : 10
u^-1 = 11/130
-1 < 0
1/(u^1) = 11/130 // * u^1
1 = 11/130*u^1 // : 11/130
130/11 = u^1
u = 130/11
u = 130/11
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