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l in (-oo:+oo)
2*l+(1/3)*l = 144 // - 144
2*l+(1/3)*l-144 = 0
7/3*l-144 = 0 // + 144
7/3*l = 144 // : 7/3
l = 144/7/3
l = 432/7
l = 432/7
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