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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6/u = -4 // + 4
6/u+4 = 0
6*u^-1 = -4 // : 6
u^-1 = -2/3
-1 < 0
1/(u^1) = -2/3 // * u^1
1 = -2/3*u^1 // : -2/3
-3/2 = u^1
u = -3/2
u = -3/2
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