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k in (-oo:+oo)
2*k-(3/(-5)) = 3 // - 3
2*k-(3/(-5))-3 = 0
2*k+3/5-3 = 0
2*k-12/5 = 0 // + 12/5
2*k = 12/5 // : 2
k = 12/5/2
k = 6/5
k = 6/5
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