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k in (-oo:+oo)
6*k-(2*k)+1 = 29 // - 29
6*k-(2*k)-29+1 = 0
6*k-2*k-29+1 = 0
4*k-28 = 0 // + 28
4*k = 28 // : 4
k = 28/4
k = 7
k = 7
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