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To find the numerical equivalent of the expression 3^(9) * 3^(-5), we can use the rule of exponentiation, which states that when you multiply numbers with the same base, you add the exponents.
So, 3^(9) * 3^(-5) = 3^(9 + -5) = 3^(4).
Thus, the numerical equivalent of the expression 3^(9) * 3^(-5) is 3^4, which is equal to 81.