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k in (-oo:+oo)
3*k = 4/5 // - 4/5
3*k-(4/5) = 0
3*k-4/5 = 0
3*k-4/5 = 0 // + 4/5
3*k = 4/5 // : 3
k = 4/5/3
k = 4/15
k = 4/15
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