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k in (-oo:+oo)
2*k-(1/5) = 3 // - 3
2*k-(1/5)-3 = 0
2*k-1/5-3 = 0
2*k-16/5 = 0 // + 16/5
2*k = 16/5 // : 2
k = 16/5/2
k = 8/5
k = 8/5
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