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4a-1=2a+13
We move all terms to the left:
4a-1-(2a+13)=0
We get rid of parentheses
4a-2a-13-1=0
We add all the numbers together, and all the variables
2a-14=0
We move all terms containing a to the left, all other terms to the right
2a=14
a=14/2
a=7
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