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k in (-oo:+oo)
(2/15)*k = 2/5 // - 2/5
(2/15)*k-(2/5) = 0
(2/15)*k-2/5 = 0
2/15*k-2/5 = 0 // + 2/5
2/15*k = 2/5 // : 2/15
k = 2/5/2/15
k = 3
k = 3
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