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k in (-oo:+oo)
k-(5*k)-1 = -29 // + 29
k-(5*k)-1+29 = 0
k-5*k-1+29 = 0
28-4*k = 0 // - 28
-4*k = -28 // : -4
k = -28/(-4)
k = 7
k = 7
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