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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-6 = 1-1/u // - 1-1/u
-(-1/u)-6-1 = 0
u^-1-6-1 = 0
1*u^-1 = 7 // : 1
u^-1 = 7
-1 < 0
1/(u^1) = 7 // * u^1
1 = 7*u^1 // : 7
1/7 = u^1
u = 1/7
u = 1/7
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