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k in (-oo:+oo)
-k-6 = 3*k+22 // - 3*k+22
-k-(3*k)-22-6 = 0
-k-3*k-22-6 = 0
-4*k-28 = 0 // + 28
-4*k = 28 // : -4
k = 28/(-4)
k = -7
k = -7
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