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8a+15=6a+27
We move all terms to the left:
8a+15-(6a+27)=0
We get rid of parentheses
8a-6a-27+15=0
We add all the numbers together, and all the variables
2a-12=0
We move all terms containing a to the left, all other terms to the right
2a=12
a=12/2
a=6
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