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9b=3b-13
We move all terms to the left:
9b-(3b-13)=0
We get rid of parentheses
9b-3b+13=0
We add all the numbers together, and all the variables
6b+13=0
We move all terms containing b to the left, all other terms to the right
6b=-13
b=-13/6
b=-2+1/6
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