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l in (-oo:+oo)
2*l+2*(1/4)*l = 300 // - 300
2*l+2*(1/4)*l-300 = 0
5/2*l-300 = 0 // + 300
5/2*l = 300 // : 5/2
l = 300/5/2
l = 120
l = 120
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