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h^(5) r^(-7) + r^(-2) h^(3)
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h^(6) r^(-4)
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I got (r^4)/h.
Now tell me how I got there.
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The key things to know are: that you can write this as a sum of two fractions, that a negative power means *1 over the number raised to the positive power*, and the rules of adding and subtracting exponents.
Here is how it works out:
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