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k in (-oo:+oo)
3/6 = k/18 // - k/18
3/6-(k/18) = 0
1/2-1/18*k = 0 // - 1/2
-1/18*k = -1/2 // : -1/18
k = -1/2/(-1/18)
k = 9
k = 9
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