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k in (-oo:+oo)
(-6/7)*k+4*k+1 = 31/42 // - 31/42
(-6/7)*k+4*k-(31/42)+1 = 0
(-6/7)*k+4*k-31/42+1 = 0
22/7*k+11/42 = 0 // - 11/42
22/7*k = -11/42 // : 22/7
k = -11/42/22/7
k = -1/12
k = -1/12
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