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k in (-oo:+oo)
8/9-((3/5)*k) = 227/225 // - 227/225
8/9-((3/5)*k)-(227/225) = 0
(-3/5)*k+8/9-227/225 = 0
-3/5*k-3/25 = 0 // + 3/25
-3/5*k = 3/25 // : -3/5
k = 3/25/(-3/5)
k = -1/5
k = -1/5
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