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l in (-oo:+oo)
(1/3)*l = 166.5 // - 166.5
(1/3)*l-166.5 = 0
1/3*l-166.5 = 0 // + 166.5
1/3*l = 166.5 // : 1/3
l = 166.5/1/3
l = 499.500005
l = 499.500005
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