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k in (-oo:+oo)
6*k+(2/7)*k+3 = -331/7 // + -331/7
6*k+(2/7)*k-(-331/7)+3 = 0
6*k+(2/7)*k+331/7+3 = 0
44/7*k+352/7 = 0 // - 352/7
44/7*k = -352/7 // : 44/7
k = -352/7/44/7
k = -8
k = -8
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