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k in (-oo:+oo)
6*k+7 = 3*k-17 // - 3*k-17
6*k-(3*k)+7+17 = 0
6*k-3*k+7+17 = 0
3*k+24 = 0 // - 24
3*k = -24 // : 3
k = -24/3
k = -8
k = -8
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