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a+a-31=a+34
We move all terms to the left:
a+a-31-(a+34)=0
We add all the numbers together, and all the variables
2a-(a+34)-31=0
We get rid of parentheses
2a-a-34-31=0
We add all the numbers together, and all the variables
a-65=0
We move all terms containing a to the left, all other terms to the right
a=65
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