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31a-2=4a+25
We move all terms to the left:
31a-2-(4a+25)=0
We get rid of parentheses
31a-4a-25-2=0
We add all the numbers together, and all the variables
27a-27=0
We move all terms containing a to the left, all other terms to the right
27a=27
a=27/27
a=1
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