Solve: 4 ln x = 2 ln 25

Divide both sides of 4 ln x = 2 ln 25 by 4 to get ln x = (1/2) ln 25. Since (1/2) ln 25 = ln(√25) = ln 5, we have ln x = ln 5, so x = 5. The correct choice is A, x = 5.

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