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l in (-oo:+oo)
-6*l = -15/6 // + -15/6
-6*l-(-15/6) = 0
5/2-6*l = 0
5/2-6*l = 0 // - 5/2
-6*l = -5/2 // : -6
l = -5/2/(-6)
l = 5/12
l = 5/12
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