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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2/u-5 = 6/9 // - 6/9
2/u-(6/9)-5 = 0
2/u-2/3-5 = 0
2*u^-1 = 17/3 // : 2
u^-1 = 17/6
-1 < 0
1/(u^1) = 17/6 // * u^1
1 = 17/6*u^1 // : 17/6
6/17 = u^1
u = 6/17
u = 6/17
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