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b in (-oo:+oo)
10 = (b^2)/3 // - (b^2)/3
10-((b^2)/3) = 0
-1/3*b^2 = -10 // : -1/3
b^2 = 30
b^2 = 30 // ^ 1/2
abs(b) = 30^(1/2)
b = 30^(1/2) or b = -30^(1/2)
b in { 30^(1/2), -30^(1/2) }
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