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9=b-2-2b
We move all terms to the left:
9-(b-2-2b)=0
We add all the numbers together, and all the variables
-(-1b-2)+9=0
We get rid of parentheses
1b+2+9=0
We add all the numbers together, and all the variables
b+11=0
We move all terms containing b to the left, all other terms to the right
b=-11
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