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k in (-oo:+oo)
6*k-5 = 2*k-(39/11) // - 2*k-(39/11)
6*k-(2*k)+39/11-5 = 0
6*k-2*k+39/11-5 = 0
4*k-16/11 = 0 // + 16/11
4*k = 16/11 // : 4
k = 16/11/4
k = 4/11
k = 4/11
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