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5^(a+2)=1/125
We move all terms to the left:
5^(a+2)-(1/125)=0
We add all the numbers together, and all the variables
5^(a+2)-(+1/125)=0
We get rid of parentheses
5^(a+2)-1/125=0
We multiply all the terms by the denominator
(5^(a+2))*125-1=0
We move all terms containing a to the left, all other terms to the right
(5^(a+2))*125=1
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