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k in (-oo:+oo)
-20 = 6*k-(3*k)-5 // - 6*k-(3*k)-5
3*k-(6*k)-20+5 = 0
3*k-6*k-20+5 = 0
-3*k-15 = 0 // + 15
-3*k = 15 // : -3
k = 15/(-3)
k = -5
k = -5
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