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k in (-oo:+oo)
13/7 = (6/7)*k-k+6/7 // - (6/7)*k-k+6/7
k-((6/7)*k)+13/7-(6/7) = 0
(-6/7)*k+k+13/7-6/7 = 0
1/7*k+1 = 0 // - 1
1/7*k = -1 // : 1/7
k = -1/1/7
k = -7
k = -7
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