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