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4=a-12/3
We move all terms to the left:
4-(a-12/3)=0
We add all the numbers together, and all the variables
-(a-4)+4=0
We get rid of parentheses
-a+4+4=0
We add all the numbers together, and all the variables
-1a+8=0
We move all terms containing a to the left, all other terms to the right
-a=-8
a=-8/-1
a=+8
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