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