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x in (-oo:+oo)
(2*x^2)/n = 8*x^2 // - 8*x^2
(2*x^2)/n-(8*x^2) = 0
(2*x^2)/n-8*x^2 = 0
2*n^-1*x^2-8*x^2 = 0
t_1 = x^2
2*n^-1*t_1^1-8*t_1^1 = 0
-8*t_1 = 0 // : -8
t_1 = 0
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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