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12a-15=8a+
We move all terms to the left:
12a-15-(8a+)=0
We add all the numbers together, and all the variables
12a-(+8a)-15=0
We get rid of parentheses
12a-8a-15=0
We add all the numbers together, and all the variables
4a-15=0
We move all terms containing a to the left, all other terms to the right
4a=15
a=15/4
a=3+3/4
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