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3-2b=7b+4
We move all terms to the left:
3-2b-(7b+4)=0
We get rid of parentheses
-2b-7b-4+3=0
We add all the numbers together, and all the variables
-9b-1=0
We move all terms containing b to the left, all other terms to the right
-9b=1
b=1/-9
b=-1/9
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