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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
9/u = 7/11 // - 7/11
9/u-(7/11) = 0
9/u-7/11 = 0
9*u^-1 = 7/11 // : 9
u^-1 = 7/99
-1 < 0
1/(u^1) = 7/99 // * u^1
1 = 7/99*u^1 // : 7/99
99/7 = u^1
u = 99/7
u = 99/7
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