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3+6a=15+3a
We move all terms to the left:
3+6a-(15+3a)=0
We add all the numbers together, and all the variables
6a-(3a+15)+3=0
We get rid of parentheses
6a-3a-15+3=0
We add all the numbers together, and all the variables
3a-12=0
We move all terms containing a to the left, all other terms to the right
3a=12
a=12/3
a=4
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