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12=108-b
We move all terms to the left:
12-(108-b)=0
We add all the numbers together, and all the variables
-(-1b+108)+12=0
We get rid of parentheses
1b-108+12=0
We add all the numbers together, and all the variables
b-96=0
We move all terms containing b to the left, all other terms to the right
b=96
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