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6(3+3b)=126
We move all terms to the left:
6(3+3b)-(126)=0
We add all the numbers together, and all the variables
6(3b+3)-126=0
We multiply parentheses
18b+18-126=0
We add all the numbers together, and all the variables
18b-108=0
We move all terms containing b to the left, all other terms to the right
18b=108
b=108/18
b=6
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