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7a=39-6a
We move all terms to the left:
7a-(39-6a)=0
We add all the numbers together, and all the variables
7a-(-6a+39)=0
We get rid of parentheses
7a+6a-39=0
We add all the numbers together, and all the variables
13a-39=0
We move all terms containing a to the left, all other terms to the right
13a=39
a=39/13
a=3
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