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k in (-oo:+oo)
-(5*k)-1/9 = -277/63 // + -277/63
-(5*k)-1/9-(-277/63) = 0
277/63-5*k-1/9 = 0
30/7-5*k = 0 // - 30/7
-5*k = -30/7 // : -5
k = -30/7/(-5)
k = 6/7
k = 6/7
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