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4b=2b-6
We move all terms to the left:
4b-(2b-6)=0
We get rid of parentheses
4b-2b+6=0
We add all the numbers together, and all the variables
2b+6=0
We move all terms containing b to the left, all other terms to the right
2b=-6
b=-6/2
b=-3
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