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13=8+b

We move all terms to the left:

13-(8+b)=0

We add all the numbers together, and all the variables

-(b+8)+13=0

We get rid of parentheses

-b-8+13=0

We add all the numbers together, and all the variables

-1b+5=0

We move all terms containing b to the left, all other terms to the right

-b=-5

b=-5/-1

b=+5

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