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1+2+b=4b+9
We move all terms to the left:
1+2+b-(4b+9)=0
We add all the numbers together, and all the variables
b-(4b+9)+3=0
We get rid of parentheses
b-4b-9+3=0
We add all the numbers together, and all the variables
-3b-6=0
We move all terms containing b to the left, all other terms to the right
-3b=6
b=6/-3
b=-2
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