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n in (-oo:+oo)
((5*n)/2)*n-1 = 0
5/2*n^2 = 1 // : 5/2
n^2 = 2/5
n^2 = 2/5 // ^ 1/2
abs(n) = (2/5)^(1/2)
n = (2/5)^(1/2) or n = -(2/5)^(1/2)
n in { (2/5)^(1/2), -(2/5)^(1/2) }
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