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D( b )
(-3*b^-4*b^-1)^3 = 0
b = 0
(-3*b^-4*b^-1)^3 = 0
(-3*b^-4*b^-1)^3 = 0
-27*b^-15 = 0 // : -27
b^-15 = 0
b naleu017Cy do O
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(-9*b^-5)/((-3*b^-4*b^-1)^3) = 0
1/3*b^10 = 0 // : 1/3
b^10 = 0
b = 0
b in { 0}
b belongs to the empty set
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