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