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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
108 = (12/b)*b^3 // - (12/b)*b^3
108-((12/b)*b^3) = 0
108-12*b^2 = 0
-12*b^2 = -108 // : -12
b^2 = 9
b^2 = 9 // ^ 1/2
abs(b) = 3
b = 3 or b = -3
b in { 3, -3 }
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