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N in (-oo:+oo)
N^2 = 9/64 // - 9/64
N^2-(9/64) = 0
N^2-9/64 = 0
1*N^2 = 9/64 // : 1
N^2 = 9/64
N^2 = 9/64 // ^ 1/2
abs(N) = 3/8
N = 3/8 or N = -3/8
N in { 3/8, -3/8 }
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