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k in (-oo:+oo)
(14*k)/9 = 4*k-198 // - 4*k-198
(14*k)/9-(4*k)+198 = 0
(14*k)/9-4*k+198 = 0
198-22/9*k = 0 // - 198
-22/9*k = -198 // : -22/9
k = -198/(-22/9)
k = 81
k = 81
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