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l in (-oo:+oo)
(3*l)/2 = 3/2 // - 3/2
(3*l)/2-(3/2) = 0
(3*l)/2-3/2 = 0
3/2*l-3/2 = 0 // + 3/2
3/2*l = 3/2 // : 3/2
l = 3/2/3/2
l = 1
l = 1
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