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k in (-oo:+oo)
-(3*k)-5 = 3*k-77 // - 3*k-77
77-(3*k)-(3*k)-5 = 0
77-3*k-3*k-5 = 0
72-6*k = 0 // - 72
-6*k = -72 // : -6
k = -72/(-6)
k = 12
k = 12
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