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L in (-oo:+oo)
120 = (1/2)^2*L+2*L // - (1/2)^2*L+2*L
120-((1/2)^2*L)-(2*L) = 0
120-((1/2)^2*L)-2*L = 0
120-9/4*L = 0 // - 120
-9/4*L = -120 // : -9/4
L = -120/(-9/4)
L = 160/3
L = 160/3
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