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(13b-4)-3(4b+2)=-4
We move all terms to the left:
(13b-4)-3(4b+2)-(-4)=0
We add all the numbers together, and all the variables
(13b-4)-3(4b+2)+4=0
We multiply parentheses
(13b-4)-12b-6+4=0
We get rid of parentheses
13b-12b-4-6+4=0
We add all the numbers together, and all the variables
b-6=0
We move all terms containing b to the left, all other terms to the right
b=6
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