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2(3a-7)=13
We move all terms to the left:
2(3a-7)-(13)=0
We multiply parentheses
6a-14-13=0
We add all the numbers together, and all the variables
6a-27=0
We move all terms containing a to the left, all other terms to the right
6a=27
a=27/6
a=4+1/2
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