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13=5b+8

We move all terms to the left:

13-(5b+8)=0

We get rid of parentheses

-5b-8+13=0

We add all the numbers together, and all the variables

-5b+5=0

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

-5b=-5

b=-5/-5

b=1

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