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b in (-oo:+oo)
8 = (1/3)*b^2 // - (1/3)*b^2
8-((1/3)*b^2) = 0
(-1/3)*b^2+8 = 0
-1/3*b^2 = -8 // : -1/3
b^2 = 24
b^2 = 24 // ^ 1/2
abs(b) = 2*6^(1/2)
b = 2*6^(1/2) or b = -(2*6^(1/2))
b in { 2*6^(1/2), -(2*6^(1/2)) }
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