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k in (-oo:+oo)
-67/245 = (-1/2)*k-((2/7)*k)+2/5 // - (-1/2)*k-((2/7)*k)+2/5
(2/7)*k-((-1/2)*k)-67/245-(2/5) = 0
(1/2)*k+(2/7)*k-67/245-2/5 = 0
11/14*k-33/49 = 0 // + 33/49
11/14*k = 33/49 // : 11/14
k = 33/49/11/14
k = 6/7
k = 6/7
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