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4a-15=2a+1
We move all terms to the left:
4a-15-(2a+1)=0
We get rid of parentheses
4a-2a-1-15=0
We add all the numbers together, and all the variables
2a-16=0
We move all terms containing a to the left, all other terms to the right
2a=16
a=16/2
a=8
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