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2a-8a=12+-8a
We move all terms to the left:
2a-8a-(12+-8a)=0
We add all the numbers together, and all the variables
2a-8a-(-8a)=0
We add all the numbers together, and all the variables
-6a-(-8a)=0
We get rid of parentheses
-6a+8a=0
We add all the numbers together, and all the variables
2a=0
a=0/2
a=0
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