5^(5-x)/(2^(x-5))=100
5^(5-x)*2^(5-x)=100
10^(5-x)=10^2
5-x=2; x=3
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5^(5-x)/(2^(x-5))=100
5^(5-x)*2^(5-x)=100
10^(5-x)=10^2
5-x=2; x=3