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L in (-oo:+oo)
L/30 = 30/200 // - 30/200
L/30-(30/200) = 0
L/30-3/20 = 0
1/30*L-3/20 = 0 // + 3/20
1/30*L = 3/20 // : 1/30
L = 3/20/1/30
L = 9/2
L = 9/2
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