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