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k in (-oo:+oo)
4*k-(6*k)+2 = 18 // - 18
4*k-(6*k)-18+2 = 0
4*k-6*k-18+2 = 0
-2*k-16 = 0 // + 16
-2*k = 16 // : -2
k = 16/(-2)
k = -8
k = -8
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