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k in (-oo:+oo)
(2/3)*k = 2.08 // - 2.08
(2/3)*k-2.08 = 0
2/3*k-2.08 = 0 // + 2.08
2/3*k = 2.08 // : 2/3
k = 2.08/2/3
k = 3.11999998
k = 3.11999998
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