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