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k in (-oo:+oo)
244/35 = (4/7)*k+2*k+8 // - (4/7)*k+2*k+8
244/35-((4/7)*k)-(2*k)-8 = 0
(-4/7)*k-2*k+244/35-8 = 0
-18/7*k-36/35 = 0 // + 36/35
-18/7*k = 36/35 // : -18/7
k = 36/35/(-18/7)
k = -2/5
k = -2/5
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