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l in (-oo:+oo)
310 = (4/6)*l // - (4/6)*l
310-((4/6)*l) = 0
(-2/3)*l+310 = 0
310-2/3*l = 0 // - 310
-2/3*l = -310 // : -2/3
l = -310/(-2/3)
l = 465
l = 465
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