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11b-7=2b+11
We move all terms to the left:
11b-7-(2b+11)=0
We get rid of parentheses
11b-2b-11-7=0
We add all the numbers together, and all the variables
9b-18=0
We move all terms containing b to the left, all other terms to the right
9b=18
b=18/9
b=2
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