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l in (-oo:+oo)
270 = 2*l+(4/3)*l // - 2*l+(4/3)*l
270-(2*l)-((4/3)*l) = 0
(-4/3)*l-2*l+270 = 0
270-10/3*l = 0 // - 270
-10/3*l = -270 // : -10/3
l = -270/(-10/3)
l = 81
l = 81
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