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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
11/u = 8/17 // - 8/17
11/u-(8/17) = 0
11/u-8/17 = 0
11*u^-1 = 8/17 // : 11
u^-1 = 8/187
-1 < 0
1/(u^1) = 8/187 // * u^1
1 = 8/187*u^1 // : 8/187
187/8 = u^1
u = 187/8
u = 187/8
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