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l in (-oo:+oo)
(-3/5)*l = -40 // + 40
(-3/5)*l+40 = 0
40-3/5*l = 0 // - 40
-3/5*l = -40 // : -3/5
l = -40/(-3/5)
l = 200/3
l = 200/3
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