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