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11b=4b+9
We move all terms to the left:
11b-(4b+9)=0
We get rid of parentheses
11b-4b-9=0
We add all the numbers together, and all the variables
7b-9=0
We move all terms containing b to the left, all other terms to the right
7b=9
b=9/7
b=1+2/7
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