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b in (-oo:+oo)
((3*b)/2)*b = 2400 // - 2400
((3*b)/2)*b-2400 = 0
3/2*b^2 = 2400 // : 3/2
b^2 = 1600
b^2 = 1600 // ^ 1/2
abs(b) = 40
b = 40 or b = -40
b in { 40, -40 }
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