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k in (-oo:+oo)
41 = 2*k+4*k-1 // - 2*k+4*k-1
1-(2*k)-(4*k)+41 = 0
1-2*k-4*k+41 = 0
42-6*k = 0 // - 42
-6*k = -42 // : -6
k = -42/(-6)
k = 7
k = 7
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