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B in (-oo:+oo)
24 = 3*(1/2)*B^2 // - 3*(1/2)*B^2
24-(3*(1/2)*B^2) = 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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