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k in (-oo:+oo)
29 = 6*k-2*k+9 // - 6*k-2*k+9
29-(-2*k)-(6*k)-9 = 0
2*k-6*k-9+29 = 0
20-4*k = 0 // - 20
-4*k = -20 // : -4
k = -20/(-4)
k = 5
k = 5
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