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L in (-oo:+oo)
68 = (1/220)*L+18 // - (1/220)*L+18
68-((1/220)*L)-18 = 0
(-1/220)*L-18+68 = 0
50-1/220*L = 0 // - 50
-1/220*L = -50 // : -1/220
L = -50/(-1/220)
L = 11000
L = 11000
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