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20b+4=11b+13
We move all terms to the left:
20b+4-(11b+13)=0
We get rid of parentheses
20b-11b-13+4=0
We add all the numbers together, and all the variables
9b-9=0
We move all terms containing b to the left, all other terms to the right
9b=9
b=9/9
b=1
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