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k in (-oo:+oo)
(2/7)*k+5 = 27/7 // - 27/7
(2/7)*k-(27/7)+5 = 0
(2/7)*k-27/7+5 = 0
2/7*k+8/7 = 0 // - 8/7
2/7*k = -8/7 // : 2/7
k = -8/7/2/7
k = -4
k = -4
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