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if f(x) = lim(n->oo) 2/n^2(sum(k=1)^n kx...

if `f(x) = lim_(n->oo) 2/n^2(sum_(k=1)^n kx)((3^(nx)-1)/(3^(nx)+1))` where`n in N`, then find the sum of all the solution of the equation `f(x) = |x^2 - 2|`

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