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n in (-oo:+oo)
n^2 = 9/25 // - 9/25
n^2-(9/25) = 0
n^2-9/25 = 0
1*n^2 = 9/25 // : 1
n^2 = 9/25
n^2 = 9/25 // ^ 1/2
abs(n) = 3/5
n = 3/5 or n = -3/5
n in { 3/5, -3/5 }
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