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D( b )
b^-3 = 0
b = 0
b^-3 = 0
b^-3 = 0
1*b^-3 = 0 // : 1
b^-3 = 0
b naleu017Cy do O
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(b^1*((((b^1)/3)/(b^-3))/4))/4 = 0
(b*(((b/3)/(b^-3))/4))/4 = 0
1/48*b^5 = 0 // : 1/48
b^5 = 0
b = 0
b in { 0}
b belongs to the empty set
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