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k in (-oo:+oo)
2*k-9 = 3*k-5 // - 3*k-5
2*k-(3*k)-9+5 = 0
2*k-3*k-9+5 = 0
-k-4 = 0 // + 4
-k = 4 // * -1
k = -4
k = -4
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