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k in (-oo:+oo)
1-4*k-(3*k) = -41 // + 41
1-4*k-(3*k)+41 = 0
1-4*k-3*k+41 = 0
42-7*k = 0 // - 42
-7*k = -42 // : -7
k = -42/(-7)
k = 6
k = 6
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