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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
13/u = 5/11 // - 5/11
13/u-(5/11) = 0
13/u-5/11 = 0
13*u^-1 = 5/11 // : 13
u^-1 = 5/143
-1 < 0
1/(u^1) = 5/143 // * u^1
1 = 5/143*u^1 // : 5/143
143/5 = u^1
u = 143/5
u = 143/5
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