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-3(4b+1)=-12b-3
We move all terms to the left:
-3(4b+1)-(-12b-3)=0
We multiply parentheses
-12b-(-12b-3)-3=0
We get rid of parentheses
-12b+12b+3-3=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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