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2b-4=-4+2b
We move all terms to the left:
2b-4-(-4+2b)=0
We add all the numbers together, and all the variables
2b-(2b-4)-4=0
We get rid of parentheses
2b-2b+4-4=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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