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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6.5/u = 3/11.7 // - 3/11.7
6.5/u-(3/11.7) = 0
6.5/u-0.25641026 = 0
6.5*u^-1 = 0.25641026 // : 6.5
u^-1 = 0.03944773
-1 < 0
1/(u^1) = 0.03944773 // * u^1
1 = 0.03944773*u^1 // : 0.03944773
25.35000113 = u^1
u = 25.35000113
u = 25.35000113
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