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18=9(b-1)
We move all terms to the left:
18-(9(b-1))=0
We calculate terms in parentheses: -(9(b-1)), so:We get rid of parentheses
9(b-1)
We multiply parentheses
9b-9
Back to the equation:
-(9b-9)
-9b+9+18=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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