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