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k in (-oo:+oo)
(3/5)*k+1/5 = 22/5 // - 22/5
(3/5)*k+1/5-(22/5) = 0
(3/5)*k+1/5-22/5 = 0
3/5*k-21/5 = 0 // + 21/5
3/5*k = 21/5 // : 3/5
k = 21/5/3/5
k = 7
k = 7
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