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k in (-oo:+oo)
7 = 6*k-(2*k)-1 // - 6*k-(2*k)-1
2*k-(6*k)+1+7 = 0
2*k-6*k+1+7 = 0
8-4*k = 0 // - 8
-4*k = -8 // : -4
k = -8/(-4)
k = 2
k = 2
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