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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
u+3/u+4 = u+3/u-5+1 // - u+3/u-5+1
u-u+3/u-(3/u)-1+4+5 = 0
u-u+3/u-3*u^-1-1+4+5 = 0
8 = 0
u belongs to the empty set
u belongs to the empty set
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