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k in (-oo:+oo)
(3/7)*k+6 = 18/7 // - 18/7
(3/7)*k-(18/7)+6 = 0
(3/7)*k-18/7+6 = 0
3/7*k+24/7 = 0 // - 24/7
3/7*k = -24/7 // : 3/7
k = -24/7/3/7
k = -8
k = -8
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