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3a+13=9a+1
We move all terms to the left:
3a+13-(9a+1)=0
We get rid of parentheses
3a-9a-1+13=0
We add all the numbers together, and all the variables
-6a+12=0
We move all terms containing a to the left, all other terms to the right
-6a=-12
a=-12/-6
a=+2
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