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l in (-oo:+oo)
280 = 2*l+(2*2)/3 // - 2*l+(2*2)/3
280-(2*l)-((2*2)/3) = 0
280-2*l-4/3 = 0
836/3-2*l = 0 // - 836/3
-2*l = -836/3 // : -2
l = -836/3/(-2)
l = 418/3
l = 418/3
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