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4b=3(3b-15)
We move all terms to the left:
4b-(3(3b-15))=0
We calculate terms in parentheses: -(3(3b-15)), so:We get rid of parentheses
3(3b-15)
We multiply parentheses
9b-45
Back to the equation:
-(9b-45)
4b-9b+45=0
We add all the numbers together, and all the variables
-5b+45=0
We move all terms containing b to the left, all other terms to the right
-5b=-45
b=-45/-5
b=+9
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