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4(5b-20)=1000
We move all terms to the left:
4(5b-20)-(1000)=0
We multiply parentheses
20b-80-1000=0
We add all the numbers together, and all the variables
20b-1080=0
We move all terms containing b to the left, all other terms to the right
20b=1080
b=1080/20
b=54
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