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n in (-oo:+oo)
n^2 = 4/9 // - 4/9
n^2-(4/9) = 0
n^2-4/9 = 0
1*n^2 = 4/9 // : 1
n^2 = 4/9
n^2 = 4/9 // ^ 1/2
abs(n) = 2/3
n = 2/3 or n = -2/3
n in { 2/3, -2/3 }
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