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k in (-oo:+oo)
-4*k-5 = 5*k-113 // - 5*k-113
113-4*k-(5*k)-5 = 0
113-4*k-5*k-5 = 0
108-9*k = 0 // - 108
-9*k = -108 // : -9
k = -108/(-9)
k = 12
k = 12
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