5 raised to power x-1 * 2 raised to power x-1=400
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Answer:
5^(x-1)*2^(x-1) = 400
=> (10)^(x-1) = 400
=> log10^(x-1) = log400
=> (x-1)*1 = log4 + 2log10
=> x-1 = 0.6020+2
=> x = 3.6020
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