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l in (-oo:+oo)
l/15 = 14/10 // - 14/10
l/15-(14/10) = 0
l/15-7/5 = 0
1/15*l-7/5 = 0 // + 7/5
1/15*l = 7/5 // : 1/15
l = 7/5/1/15
l = 21
l = 21
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