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5(b-4)=4b+9
We move all terms to the left:
5(b-4)-(4b+9)=0
We multiply parentheses
5b-(4b+9)-20=0
We get rid of parentheses
5b-4b-9-20=0
We add all the numbers together, and all the variables
b-29=0
We move all terms containing b to the left, all other terms to the right
b=29
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