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k in (-oo:+oo)
-(5*k)-5 = -65 // + 65
65-(5*k)-5 = 0
65-5*k-5 = 0
60-5*k = 0 // - 60
-5*k = -60 // : -5
k = -60/(-5)
k = 12
k = 12
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