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k in (-oo:+oo)
k-(6*k)-(7/9) = 58/99 // - 58/99
k-(6*k)-(7/9)-(58/99) = 0
k-6*k-7/9-58/99 = 0
-5*k-15/11 = 0 // + 15/11
-5*k = 15/11 // : -5
k = 15/11/(-5)
k = -3/11
k = -3/11
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