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5a=6a-12
We move all terms to the left:
5a-(6a-12)=0
We get rid of parentheses
5a-6a+12=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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