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13b-1=3b+9
We move all terms to the left:
13b-1-(3b+9)=0
We get rid of parentheses
13b-3b-9-1=0
We add all the numbers together, and all the variables
10b-10=0
We move all terms containing b to the left, all other terms to the right
10b=10
b=10/10
b=1
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