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k in (-oo:+oo)
4*k+6 = 2*k-6 // - 2*k-6
4*k-(2*k)+6+6 = 0
4*k-2*k+6+6 = 0
2*k+12 = 0 // - 12
2*k = -12 // : 2
k = -12/2
k = -6
k = -6
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