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k in (-oo:+oo)
9/8-(k/7) = 1/56 // - 1/56
9/8-(k/7)-(1/56) = 0
9/8-(k/7)-1/56 = 0
31/28-1/7*k = 0 // - 31/28
-1/7*k = -31/28 // : -1/7
k = -31/28/(-1/7)
k = 31/4
k = 31/4
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