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3(b+4)=3(2b-9)
We move all terms to the left:
3(b+4)-(3(2b-9))=0
We multiply parentheses
3b-(3(2b-9))+12=0
We calculate terms in parentheses: -(3(2b-9)), so:We get rid of parentheses
3(2b-9)
We multiply parentheses
6b-27
Back to the equation:
-(6b-27)
3b-6b+27+12=0
We add all the numbers together, and all the variables
-3b+39=0
We move all terms containing b to the left, all other terms to the right
-3b=-39
b=-39/-3
b=+13
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