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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
17 = 153/u // - 153/u
17-(153/u) = 0
17-153*u^-1 = 0
-153*u^-1 = -17 // : -153
u^-1 = 1/9
-1 < 0
1/(u^1) = 1/9 // * u^1
1 = 1/9*u^1 // : 1/9
9 = u^1
u = 9
u = 9
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