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x in (-oo:+oo)
(n/7)*x^2 = 1/12 // - 1/12
(n/7)*x^2-(1/12) = 0
(n/7)*x^2-1/12 = 0
1/7*n*x^2 = 1/12 // : 1/7*n
x^2 = 7/12*n^-1
x^2 = 7/12*n^-1 // ^ 1/2
abs(x) = (7/12)^(1/2)*n^(-1/2)
x = (7/12)^(1/2)*n^(-1/2) or x = -((7/12)^(1/2)*n^(-1/2))
x in { (7/12)^(1/2)*n^(-1/2), -((7/12)^(1/2)*n^(-1/2)) }
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