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n in (-oo:+oo)
1250 = (4*n^2)/2 // - (4*n^2)/2
1250-((4*n^2)/2) = 0
1250-2*n^2 = 0
-2*n^2 = -1250 // : -2
n^2 = 625
n^2 = 625 // ^ 1/2
abs(n) = 25
n = 25 or n = -25
n in { 25, -25 }
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