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k in (-oo:+oo)
(5/7)*k-4 = -k-(64/7) // + -k-(64/7)
(5/7)*k+k+64/7-4 = 0
12/7*k+36/7 = 0 // - 36/7
12/7*k = -36/7 // : 12/7
k = -36/7/12/7
k = -3
k = -3
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