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4x²-20x<25 4x²-20x+25<25+25 (2x-5)^2<50 -5 root 2 < 2x-5 < 5 root 2 5-5 radical 2 < 2x < 5 + 5 radical 2 (5-5 radical 2) / 2 < x < (5 + 5 radical 2) / 2
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