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10x - 25 = 400 - 200x + 25x^2
25x^2 - 200x - 10x + 400 + 25 = 0
25x^2 - 210x + 425 = 0
5x^2 - 42x + 85 = 0
(5x - 17) (x - 5) = 0
5x - 17 = 0
x = 17/5