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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3/u-3 = 5 // - 5
3/u-5-3 = 0
3*u^-1 = 8 // : 3
u^-1 = 8/3
-1 < 0
1/(u^1) = 8/3 // * u^1
1 = 8/3*u^1 // : 8/3
3/8 = u^1
u = 3/8
u = 3/8
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