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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
((6*b^-1)/3)*b^8 = 0
2*b^7 = 0 // : 2
b^7 = 0
b = 0
b in { 0}
b belongs to the empty set
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