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l in (-oo:+oo)
2*l+2*(2/3)*l = 310 // - 310
2*l+2*(2/3)*l-310 = 0
10/3*l-310 = 0 // + 310
10/3*l = 310 // : 10/3
l = 310/10/3
l = 93
l = 93
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