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k in (-oo:+oo)
(2/7)*k+(2/5)*k+6 = 18/7 // - 18/7
(2/7)*k+(2/5)*k-(18/7)+6 = 0
(2/7)*k+(2/5)*k-18/7+6 = 0
24/35*k+24/7 = 0 // - 24/7
24/35*k = -24/7 // : 24/35
k = -24/7/24/35
k = -5
k = -5
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