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k in (-oo:+oo)
3*k-7 = 16/5 // - 16/5
3*k-(16/5)-7 = 0
3*k-16/5-7 = 0
3*k-51/5 = 0 // + 51/5
3*k = 51/5 // : 3
k = 51/5/3
k = 17/5
k = 17/5
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