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6a-6=3a+15
We move all terms to the left:
6a-6-(3a+15)=0
We get rid of parentheses
6a-3a-15-6=0
We add all the numbers together, and all the variables
3a-21=0
We move all terms containing a to the left, all other terms to the right
3a=21
a=21/3
a=7
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