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Simplify this power raised to a power: (5^4)4
1. Expand using four factors of 5^4:         5^4 ∙ 5^4 ∙ 5^4 ∙ 5^4
2. Apply the product of powers rule:         5^4+ 4+ 4+ 4
3. Simplify:                   5^x
What is the value of x in the simplified power?