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k in (-oo:+oo)
2*k+2 = 5*k+17 // - 5*k+17
2*k-(5*k)-17+2 = 0
2*k-5*k-17+2 = 0
-3*k-15 = 0 // + 15
-3*k = 15 // : -3
k = 15/(-3)
k = -5
k = -5
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