(a^4x^2/(2b^5(ax+b)^2) - 4a^3x/(b^5(ax+b)) - (ax+b)^2/(2b^5x^2)) - (3a/(b^4x) - 1/(2b^3x^3) + 3a^2/(b^4(ax+b)) + a^2/(2b^3(ax+b)^2))

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