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k in (-oo:+oo)
4*k-(6*k)+6 = -2 // + 2
4*k-(6*k)+2+6 = 0
4*k-6*k+2+6 = 0
8-2*k = 0 // - 8
-2*k = -8 // : -2
k = -8/(-2)
k = 4
k = 4
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