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7a+1=2a+46
We move all terms to the left:
7a+1-(2a+46)=0
We get rid of parentheses
7a-2a-46+1=0
We add all the numbers together, and all the variables
5a-45=0
We move all terms containing a to the left, all other terms to the right
5a=45
a=45/5
a=9
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