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k in (-oo:+oo)
(4/7)*k-(3*k)+5 = 171/7 // - 171/7
(4/7)*k-(3*k)-(171/7)+5 = 0
(4/7)*k-3*k-171/7+5 = 0
-17/7*k-136/7 = 0 // + 136/7
-17/7*k = 136/7 // : -17/7
k = 136/7/(-17/7)
k = -8
k = -8
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