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l in (-oo:+oo)
l/6 = -3.8 // + 3.8
l/6+3.8 = 0
1/6*l+3.8 = 0 // - 3.8
1/6*l = -3.8 // : 1/6
l = -3.8/1/6
l = -22.79999954
l = -22.79999954
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