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5a+1=2a+7=
We move all terms to the left:
5a+1-(2a+7)=0
We get rid of parentheses
5a-2a-7+1=0
We add all the numbers together, and all the variables
3a-6=0
We move all terms containing a to the left, all other terms to the right
3a=6
a=6/3
a=2
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