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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6/u = 5/8 // - 5/8
6/u-(5/8) = 0
6/u-5/8 = 0
6*u^-1 = 5/8 // : 6
u^-1 = 5/48
-1 < 0
1/(u^1) = 5/48 // * u^1
1 = 5/48*u^1 // : 5/48
48/5 = u^1
u = 48/5
u = 48/5
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