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I'll explain by giving example:

x⁻²   = 1/x₂

3x/y₋⁹ = 3xy⁹

Notice that if the base with negative exponent is a numerator, make it a denominator with the positive exponent. (Number 1 example)

If the base with negative exponent is a denominator, make it a numerator with the positive exponent.
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