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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u-0.2 = 0.6 // - 0.6
4/u-0.6-0.2 = 0
4*u^-1 = 0.8 // : 4
u^-1 = 0.2
-1 < 0
1/(u^1) = 0.2 // * u^1
1 = 0.2*u^1 // : 0.2
5 = u^1
u = 5
u = 5
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