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93=3(3b+7)
We move all terms to the left:
93-(3(3b+7))=0
We calculate terms in parentheses: -(3(3b+7)), so:We get rid of parentheses
3(3b+7)
We multiply parentheses
9b+21
Back to the equation:
-(9b+21)
-9b-21+93=0
We add all the numbers together, and all the variables
-9b+72=0
We move all terms containing b to the left, all other terms to the right
-9b=-72
b=-72/-9
b=+8
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