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a-6+6=12+6-a
We move all terms to the left:
a-6+6-(12+6-a)=0
We add all the numbers together, and all the variables
a-(-1a+18)-6+6=0
We add all the numbers together, and all the variables
a-(-1a+18)=0
We get rid of parentheses
a+1a-18=0
We add all the numbers together, and all the variables
2a-18=0
We move all terms containing a to the left, all other terms to the right
2a=18
a=18/2
a=9
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