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4a-13=2a-1
We move all terms to the left:
4a-13-(2a-1)=0
We get rid of parentheses
4a-2a+1-13=0
We add all the numbers together, and all the variables
2a-12=0
We move all terms containing a to the left, all other terms to the right
2a=12
a=12/2
a=6
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