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k in (-oo:+oo)
6*k-(4*k)+6 = 24 // - 24
6*k-(4*k)-24+6 = 0
6*k-4*k-24+6 = 0
2*k-18 = 0 // + 18
2*k = 18 // : 2
k = 18/2
k = 9
k = 9
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