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25^-2x=125^x+7
We move all terms to the left:
25^-2x-(125^x+7)=0
We add all the numbers together, and all the variables
-2x-(125^x+7)=0
We get rid of parentheses
-2x-125^x-7=0
We move all terms containing x to the left, all other terms to the right
-2x-125^x=7
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