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-(b-3)=15-3b
We move all terms to the left:
-(b-3)-(15-3b)=0
We add all the numbers together, and all the variables
-(b-3)-(-3b+15)=0
We get rid of parentheses
-b+3b+3-15=0
We add all the numbers together, and all the variables
2b-12=0
We move all terms containing b to the left, all other terms to the right
2b=12
b=12/2
b=6
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