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D( b )
2*b^4 = 0
b^3 = 0
2*b^4 = 0
2*b^4 = 0
2*b^4 = 0 // : 2
b^4 = 0
b = 0
b^3 = 0
b^3 = 0
1*b^3 = 0 // : 1
b^3 = 0
b = 0
b in (-oo:0) U (0:+oo)
2*(((2*b^4)^-2)/(b^3))*b^2 = 0
1/2*b^-9 = 0 // : 1/2
b^-9 = 0
b należy do O
b belongs to the empty set
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