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13+4b=7b+1
We move all terms to the left:
13+4b-(7b+1)=0
We get rid of parentheses
4b-7b-1+13=0
We add all the numbers together, and all the variables
-3b+12=0
We move all terms containing b to the left, all other terms to the right
-3b=-12
b=-12/-3
b=+4
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