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n in (-oo:+oo)
(1/16)*n^2 = 4 // - 4
(1/16)*n^2-4 = 0
1/16*n^2 = 4 // : 1/16
n^2 = 64
n^2 = 64 // ^ 1/2
abs(n) = 8
n = 8 or n = -8
n in { 8, -8 }
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