find the next term of an AP 2x^3, 5x^2, 3x^3

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first, find x. Since an AP has a common difference,
5x^2 - 2x^3 = 3x^3 - 5x^2
assuming x≠0 (since 0,0,0,... is also a valid AP)
5-2x = 3-5x
now finish it off