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The sum of the square of a number and one,divided by the difference of 1 from the square gives 221/220.what is the number?

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(x^2+1)/(x^2-1) = 221/220

220 x^2 + 220 = 221 x^2 - 221
x^2 = 441
x = sqrt(441) = 21

(x^2+1)/(x^2-1) = 221/220

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