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