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Best Answer
Use natural logs.
5^(8-2X) = 25
ln5^(8-2X) = ln25
8-2X ln5 = ln25
8-2X = ln25/ln5
8-2X = 2
subtract 8 from each side
-2X = -6
divide each side by -2
X = 3
check
5^(8-3(2)) = 25
5^2 = 25
25 = 25
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