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5^2n-1-5^2n-2=100
We move all terms to the left:
5^2n-1-5^2n-2-(100)=0
We add all the numbers together, and all the variables
5^2n-5^2n-103=0
We move all terms containing n to the left, all other terms to the right
5^2n-5^2n=103
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