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L in (-oo:+oo)
210 = 2*L+2*(2/3) // - 2*L+2*(2/3)
210-(2*L)-(2*(2/3)) = 0
210-2*L-4/3 = 0
626/3-2*L = 0 // - 626/3
-2*L = -626/3 // : -2
L = -626/3/(-2)
L = 313/3
L = 313/3
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