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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
8 = -6/u // + -6/u
8-(-6/u) = 0
6*u^-1+8 = 0
6*u^-1 = -8 // : 6
u^-1 = -4/3
-1 < 0
1/(u^1) = -4/3 // * u^1
1 = -4/3*u^1 // : -4/3
-3/4 = u^1
u = -3/4
u = -3/4
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