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l in (-oo:+oo)
210 = (10/3)*l // - (10/3)*l
210-((10/3)*l) = 0
(-10/3)*l+210 = 0
210-10/3*l = 0 // - 210
-10/3*l = -210 // : -10/3
l = -210/(-10/3)
l = 63
l = 63
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