The property of negative integer exponents states that for any non-zero number a, a^-n = 1/a^n.
Using this property, we can rewrite 9^-23 as 1/9^23.
Therefore, 9^-23 can be expressed with positive exponents only as 1/9^23.
Apply the property of negative integer exponents to rewrite 9^-23 as an expression with positive exponents only.
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