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63=9(b-87)
We move all terms to the left:
63-(9(b-87))=0
We calculate terms in parentheses: -(9(b-87)), so:We get rid of parentheses
9(b-87)
We multiply parentheses
9b-783
Back to the equation:
-(9b-783)
-9b+783+63=0
We add all the numbers together, and all the variables
-9b+846=0
We move all terms containing b to the left, all other terms to the right
-9b=-846
b=-846/-9
b=+94
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