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-9=-a+6/2
We move all terms to the left:
-9-(-a+6/2)=0
We add all the numbers together, and all the variables
-(-1a+3)-9=0
We get rid of parentheses
1a-3-9=0
We add all the numbers together, and all the variables
a-12=0
We move all terms containing a to the left, all other terms to the right
a=12
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