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3a-15=4a+1
We move all terms to the left:
3a-15-(4a+1)=0
We get rid of parentheses
3a-4a-1-15=0
We add all the numbers together, and all the variables
-1a-16=0
We move all terms containing a to the left, all other terms to the right
-a=16
a=16/-1
a=-16
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