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n in (-oo:+oo)
288 = (4*n^2)/2 // - (4*n^2)/2
288-((4*n^2)/2) = 0
288-2*n^2 = 0
-2*n^2 = -288 // : -2
n^2 = 144
n^2 = 144 // ^ 1/2
abs(n) = 12
n = 12 or n = -12
n in { 12, -12 }
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