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l in (-oo:+oo)
3*(1/2)*l*l = 96 // - 96
3*(1/2)*l*l-96 = 0
3/2*l^2 = 96 // : 3/2
l^2 = 64
l^2 = 64 // ^ 1/2
abs(l) = 8
l = 8 or l = -8
l in { 8, -8 }
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