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9b-3=6b+12
We move all terms to the left:
9b-3-(6b+12)=0
We get rid of parentheses
9b-6b-12-3=0
We add all the numbers together, and all the variables
3b-15=0
We move all terms containing b to the left, all other terms to the right
3b=15
b=15/3
b=5
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