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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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