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k in (-oo:+oo)
3*k-(1/5) = 5 // - 5
3*k-(1/5)-5 = 0
3*k-1/5-5 = 0
3*k-26/5 = 0 // + 26/5
3*k = 26/5 // : 3
k = 26/5/3
k = 26/15
k = 26/15
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