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