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k in (-oo:+oo)
-(6*k)-6 = -72 // + 72
72-(6*k)-6 = 0
72-6*k-6 = 0
66-6*k = 0 // - 66
-6*k = -66 // : -6
k = -66/(-6)
k = 11
k = 11
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