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3a-15=4a+19
We move all terms to the left:
3a-15-(4a+19)=0
We get rid of parentheses
3a-4a-19-15=0
We add all the numbers together, and all the variables
-1a-34=0
We move all terms containing a to the left, all other terms to the right
-a=34
a=34/-1
a=-34
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