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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u = 5/8 // - 5/8
4/u-(5/8) = 0
4/u-5/8 = 0
4*u^-1 = 5/8 // : 4
u^-1 = 5/32
-1 < 0
1/(u^1) = 5/32 // * u^1
1 = 5/32*u^1 // : 5/32
32/5 = u^1
u = 32/5
u = 32/5
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