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k in (-oo:+oo)
-8 = 2*k-(4*k)-2 // - 2*k-(4*k)-2
4*k-(2*k)-8+2 = 0
4*k-2*k-8+2 = 0
2*k-6 = 0 // + 6
2*k = 6 // : 2
k = 6/2
k = 3
k = 3
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