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l in (-oo:+oo)
(-2/3)*l+3 = -5 // + 5
(-2/3)*l+3+5 = 0
8-2/3*l = 0 // - 8
-2/3*l = -8 // : -2/3
l = -8/(-2/3)
l = 12
l = 12
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