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b in (-oo:+oo)
24 = 3*(1/2)*b*b // - 3*(1/2)*b*b
24-(3*(1/2)*b*b) = 0
(-3/2)*b^2+24 = 0
-3/2*b^2 = -24 // : -3/2
b^2 = 16
b^2 = 16 // ^ 1/2
abs(b) = 4
b = 4 or b = -4
b in { 4, -4 }
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