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4b+13=8b+9
We move all terms to the left:
4b+13-(8b+9)=0
We get rid of parentheses
4b-8b-9+13=0
We add all the numbers together, and all the variables
-4b+4=0
We move all terms containing b to the left, all other terms to the right
-4b=-4
b=-4/-4
b=1
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