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k in (-oo:+oo)
2*k-2 = 5*k+1 // - 5*k+1
2*k-(5*k)-2-1 = 0
2*k-5*k-2-1 = 0
-3*k-3 = 0 // + 3
-3*k = 3 // : -3
k = 3/(-3)
k = -1
k = -1
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