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[d/dx (3x^3 / (3x^2 - 4))] (1-x) + 3x^3 / (3x^2 - 4) = -3
[d/dx (3x^3 / (3x^2 - 4))] (1-x) + 3x^3 / (3x^2 - 4) = -3
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