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5a-15=12+a
We move all terms to the left:
5a-15-(12+a)=0
We add all the numbers together, and all the variables
5a-(a+12)-15=0
We get rid of parentheses
5a-a-12-15=0
We add all the numbers together, and all the variables
4a-27=0
We move all terms containing a to the left, all other terms to the right
4a=27
a=27/4
a=6+3/4
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