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-2b+11=b-139
We move all terms to the left:
-2b+11-(b-139)=0
We get rid of parentheses
-2b-b+139+11=0
We add all the numbers together, and all the variables
-3b+150=0
We move all terms containing b to the left, all other terms to the right
-3b=-150
b=-150/-3
b=+50
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