Given Equation: We are given the equation 7a=87. To solve for a, we need to express both sides of the equation with the same base and exponent format.
Express with Same Base: The eighth root of a number is the same as raising that number to the power of 81. Therefore, we can rewrite the equation as 7a=781.
Equate Exponents: Now we have 7a=781. Since the bases are the same, we can equate the exponents: a=81
Final Answer: We have found the value of a to be 81, which is the final answer.
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