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k in (-oo:+oo)
(2/15)*k = 1/5 // - 1/5
(2/15)*k-(1/5) = 0
(2/15)*k-1/5 = 0
2/15*k-1/5 = 0 // + 1/5
2/15*k = 1/5 // : 2/15
k = 1/5/2/15
k = 3/2
k = 3/2
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