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L in (-oo:+oo)
270 = 2*L+2*(2/3)*L // - 2*L+2*(2/3)*L
270-(2*L)-(2*(2/3)*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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