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3(4b-12)=3b
We move all terms to the left:
3(4b-12)-(3b)=0
We add all the numbers together, and all the variables
-3b+3(4b-12)=0
We multiply parentheses
-3b+12b-36=0
We add all the numbers together, and all the variables
9b-36=0
We move all terms containing b to the left, all other terms to the right
9b=36
b=36/9
b=4
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