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k in (-oo:+oo)
2*k-(4*k)+5 = 25 // - 25
2*k-(4*k)-25+5 = 0
2*k-4*k-25+5 = 0
-2*k-20 = 0 // + 20
-2*k = 20 // : -2
k = 20/(-2)
k = -10
k = -10
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