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l in (-oo:+oo)
l+l+l/2+l/2+2+2 = 22 // - 22
l+l+l/2+l/2-22+2+2 = 0
3*l-18 = 0 // + 18
3*l = 18 // : 3
l = 18/3
l = 6
l = 6
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