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6(3a-7)=13
We move all terms to the left:
6(3a-7)-(13)=0
We multiply parentheses
18a-42-13=0
We add all the numbers together, and all the variables
18a-55=0
We move all terms containing a to the left, all other terms to the right
18a=55
a=55/18
a=3+1/18
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