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n in (-oo:+oo)
2/9 = 8*n^2 // - 8*n^2
2/9-(8*n^2) = 0
2/9-8*n^2 = 0
-8*n^2 = -2/9 // : -8
n^2 = 1/36
n^2 = 1/36 // ^ 1/2
abs(n) = 1/6
n = 1/6 or n = -1/6
n in { 1/6, -1/6 }
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