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To apply the properties of integer exponents, we know that when we multiply two powers with the same base, we add their exponents. Therefore, we can rewrite the expression as:
3^7 * 3^(-9) = 3^(7 + (-9))
Now, to simplify the expression, we add the exponents:
3^(7 + (-9)) = 3^(-2)
To convert the negative exponent to a positive exponent, we can use the property that a^(-n) = 1/a^n. Therefore:
3^(-2) = 1/3^2
Simplifying further, we get:
1/3^2 = 1/9
So, the equivalent expression is 1/9.