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D( b )
-b = 0
-b = 0
b = 0
b in (-oo:0) U (0:+oo)
(9*b^5+4*b^2)/(-b) = 0
9*b^5+4*b^2 = 0
b^2*(9*b^3+4) = 0
9*b^3 = -4 // : 9
b^3 = -4/9
b^3 = -4/9 // ^ 1/3
b = -(4/9)^(1/3)
b^2*(b+(4/9)^(1/3)) = 0
(b^2*(b+(4/9)^(1/3)))/(-b) = 0
( b+(4/9)^(1/3) )
b+(4/9)^(1/3) = 0 // - (4/9)^(1/3)
b = -(4/9)^(1/3)
( b^2 )
1*b^2 = 0 // : 1
b^2 = 0
b = 0
b in { 0}
b = -(4/9)^(1/3)
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