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k in (-oo:+oo)
-10 = 2*k-(4*k)+2 // - 2*k-(4*k)+2
4*k-(2*k)-10-2 = 0
4*k-2*k-10-2 = 0
2*k-12 = 0 // + 12
2*k = 12 // : 2
k = 12/2
k = 6
k = 6
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