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3a+6=15+a
We move all terms to the left:
3a+6-(15+a)=0
We add all the numbers together, and all the variables
3a-(a+15)+6=0
We get rid of parentheses
3a-a-15+6=0
We add all the numbers together, and all the variables
2a-9=0
We move all terms containing a to the left, all other terms to the right
2a=9
a=9/2
a=4+1/2
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