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k in (-oo:+oo)
k+3*k-(4/5) = 16/5 // - 16/5
k+3*k-(4/5)-(16/5) = 0
k+3*k-4/5-16/5 = 0
4*k-4 = 0 // + 4
4*k = 4 // : 4
k = 4/4
k = 1
k = 1
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