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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3.9/18 = 2.6/u // - 2.6/u
3.9/18-(2.6/u) = 0
3.9/18-2.6*u^-1 = 0
-2.6*u^-1 = -0.21666667 // : -2.6
u^-1 = 0.08333333
-1 < 0
1/(u^1) = 0.08333333 // * u^1
1 = 0.08333333*u^1 // : 0.08333333
12.00000048 = u^1
u = 12.00000048
u = 12.00000048
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