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limit (-n^3((x^3−x^2−8x+7)*3(n-1)^4+1)/((3n^4+1)(n-1)^3), n to inf
limit (-n^3((x^3−x^2−8x+7)*3(n-1)^4+1)/((3n^4+1)(n-1)^3), n to inf
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