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9(b-2)+4=40
We move all terms to the left:
9(b-2)+4-(40)=0
We add all the numbers together, and all the variables
9(b-2)-36=0
We multiply parentheses
9b-18-36=0
We add all the numbers together, and all the variables
9b-54=0
We move all terms containing b to the left, all other terms to the right
9b=54
b=54/9
b=6
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