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5a+39=7+13a
We move all terms to the left:
5a+39-(7+13a)=0
We add all the numbers together, and all the variables
5a-(13a+7)+39=0
We get rid of parentheses
5a-13a-7+39=0
We add all the numbers together, and all the variables
-8a+32=0
We move all terms containing a to the left, all other terms to the right
-8a=-32
a=-32/-8
a=+4
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