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k in (-oo:+oo)
(3/5)*k+(1/5)*k = 4 // - 4
(3/5)*k+(1/5)*k-4 = 0
4/5*k-4 = 0 // + 4
4/5*k = 4 // : 4/5
k = 4/4/5
k = 5
k = 5
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