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k in (-oo:+oo)
4*k+(4/7)*k+1 = 23/7 // - 23/7
4*k+(4/7)*k-(23/7)+1 = 0
4*k+(4/7)*k-23/7+1 = 0
32/7*k-16/7 = 0 // + 16/7
32/7*k = 16/7 // : 32/7
k = 16/7/32/7
k = 1/2
k = 1/2
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