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X square + 9x = 1 X square + 9x + 81 / 4 = 1 + 81 / 4 (x + 9 / 2) square = 85 / 4 X + 9 / 2 = ± root 85 / 2 X = - (9-radical 85) / 2, x = - (9 + radical 85) / 2
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