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