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9(b-9)=-108
We move all terms to the left:
9(b-9)-(-108)=0
We add all the numbers together, and all the variables
9(b-9)+108=0
We multiply parentheses
9b-81+108=0
We add all the numbers together, and all the variables
9b+27=0
We move all terms containing b to the left, all other terms to the right
9b=-27
b=-27/9
b=-3
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