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6a-8=2a+13
We move all terms to the left:
6a-8-(2a+13)=0
We get rid of parentheses
6a-2a-13-8=0
We add all the numbers together, and all the variables
4a-21=0
We move all terms containing a to the left, all other terms to the right
4a=21
a=21/4
a=5+1/4
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