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7b-13=35+4b
We move all terms to the left:
7b-13-(35+4b)=0
We add all the numbers together, and all the variables
7b-(4b+35)-13=0
We get rid of parentheses
7b-4b-35-13=0
We add all the numbers together, and all the variables
3b-48=0
We move all terms containing b to the left, all other terms to the right
3b=48
b=48/3
b=16
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