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D( b )
b^4 = 0
b^4 = 0
b^4 = 0
1*b^4 = 0 // : 1
b^4 = 0
b = 0
b in (-oo:0) U (0:+oo)
(b^7)/(b^4) = 0
1*b^3 = 0 // : 1
b^3 = 0
b = 0
b in { 0}
b belongs to the empty set
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