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k in (-oo:+oo)
2/6 = k/9 // - k/9
2/6-(k/9) = 0
1/3-1/9*k = 0 // - 1/3
-1/9*k = -1/3 // : -1/9
k = -1/3/(-1/9)
k = 3
k = 3
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