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k in (-oo:+oo)
-14 = (7/9)*k // - (7/9)*k
-((7/9)*k)-14 = 0
(-7/9)*k-14 = 0
-7/9*k-14 = 0 // + 14
-7/9*k = 14 // : -7/9
k = 14/(-7/9)
k = -18
k = -18
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