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### What is the derivative of 20x^{-8}+5x^{-3}-7x^{-7} ?

- The derivative of 20x^{-8}+5x^{-3}-7x^{-7} is -(160)/(x^9)-(15)/(x^4)+(49)/(x^8)
### What is the first derivative of 20x^{-8}+5x^{-3}-7x^{-7} ?

- The first derivative of 20x^{-8}+5x^{-3}-7x^{-7} is -(160)/(x^9)-(15)/(x^4)+(49)/(x^8)

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