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15a=27+6a
We move all terms to the left:
15a-(27+6a)=0
We add all the numbers together, and all the variables
15a-(6a+27)=0
We get rid of parentheses
15a-6a-27=0
We add all the numbers together, and all the variables
9a-27=0
We move all terms containing a to the left, all other terms to the right
9a=27
a=27/9
a=3
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