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8(12-b)=3(b+21)
We move all terms to the left:
8(12-b)-(3(b+21))=0
We add all the numbers together, and all the variables
8(-1b+12)-(3(b+21))=0
We multiply parentheses
-8b-(3(b+21))+96=0
We calculate terms in parentheses: -(3(b+21)), so:We get rid of parentheses
3(b+21)
We multiply parentheses
3b+63
Back to the equation:
-(3b+63)
-8b-3b-63+96=0
We add all the numbers together, and all the variables
-11b+33=0
We move all terms containing b to the left, all other terms to the right
-11b=-33
b=-33/-11
b=+3
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