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5a-15=6a-3
We move all terms to the left:
5a-15-(6a-3)=0
We get rid of parentheses
5a-6a+3-15=0
We add all the numbers together, and all the variables
-1a-12=0
We move all terms containing a to the left, all other terms to the right
-a=12
a=12/-1
a=-12
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