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7b-9=6+3b
We move all terms to the left:
7b-9-(6+3b)=0
We add all the numbers together, and all the variables
7b-(3b+6)-9=0
We get rid of parentheses
7b-3b-6-9=0
We add all the numbers together, and all the variables
4b-15=0
We move all terms containing b to the left, all other terms to the right
4b=15
b=15/4
b=3+3/4
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